Merge bitcoin/bitcoin#28069: guix: Remove librt usage from release binaries

8f6f0d81ee3a9ea582e9c9cf986613da86760098 guix: backport glibc patch to prevent redundant librt link (fanquake)
e14473299cd3e55ca177876df957927937648cd6 contrib: remove librt from release deps (fanquake)
e64e17830ad9323b8e5f562b1e457403b1ddaf3a build: remove check for gettimeofday & librt (fanquake)

Pull request description:

  Our release binaries currently have a runtime dependency on `librt`. However this is redundant, and only the case due to  a bug in glibc. The `clock_*` suit of funcs were absorbed into libc long ago, however an issue with compatibility code meant that librt would still be linked against / used redundantly:
  > But the forwarders were not marked as compatibility symbols.
  > As a result, on older architectures, historic configure checks such as
  > AC_CHECK_LIB(rt, clock_gettime)
  > still cause linking against librt, even though this is completely
  > unnecessary.  It also creates a needless porting hazard because
  > architectures behave differently when it comes to symbol availability.

  This PR drops our configure check for librt (which is redundant, and could be PR'd standalone), and backports [the relevant patch](https://sourceware.org/git/?p=glibc.git;a=commit;h=f289e656ec8221756519a601042bc9fbe1b310fb) into our glibc, so we can drop librt from our runtime dependencies.

  Guix Build:
  ```bash
  67078bddd5dc32801b8c916c3bc12f1404da572312f0158a89b9603c1f753969  guix-build-8f6f0d81ee3a/output/aarch64-linux-gnu/SHA256SUMS.part
  794dd00009860fd67d7e51463ee1c5ea9677dfff1c739dd0b91cf73136deb655  guix-build-8f6f0d81ee3a/output/aarch64-linux-gnu/bitcoin-8f6f0d81ee3a-aarch64-linux-gnu-debug.tar.gz
  eb9cf3f472ffbc37446fe4d80fe81dc62cf1c28c4d57dd8a7b7176e65487aeeb  guix-build-8f6f0d81ee3a/output/aarch64-linux-gnu/bitcoin-8f6f0d81ee3a-aarch64-linux-gnu.tar.gz
  e775a9e9b23be44b5c7e7121e88124746836d5bdeda1cd9ba693080d9f3a52a8  guix-build-8f6f0d81ee3a/output/arm-linux-gnueabihf/SHA256SUMS.part
  8289f0770333d800e414747026c0fb105d95f389f6c8d901c1041cc65272fb02  guix-build-8f6f0d81ee3a/output/arm-linux-gnueabihf/bitcoin-8f6f0d81ee3a-arm-linux-gnueabihf-debug.tar.gz
  e40256c5fb1b9a137845a50fc051f92c3e4cc013b0875a71c62af32f7024af9d  guix-build-8f6f0d81ee3a/output/arm-linux-gnueabihf/bitcoin-8f6f0d81ee3a-arm-linux-gnueabihf.tar.gz
  c8db222e54e78b27a8a5d3a373a9bbafa51ed29a1fda5c19e8b0eac819b002f2  guix-build-8f6f0d81ee3a/output/arm64-apple-darwin/SHA256SUMS.part
  52d4063af628467605fcf533205705b38237a0cc60cafbec224ca8cf4a644738  guix-build-8f6f0d81ee3a/output/arm64-apple-darwin/bitcoin-8f6f0d81ee3a-arm64-apple-darwin-unsigned.dmg
  103d80180a9f38e7c903d0b6581e4bb5130c640fac1fd5019eee7fa90e303c1d  guix-build-8f6f0d81ee3a/output/arm64-apple-darwin/bitcoin-8f6f0d81ee3a-arm64-apple-darwin-unsigned.tar.gz
  a8f0a89c4d4b1d05e6ea968dde3b13368999dfc1c3ea765e81fd3c4db46197b3  guix-build-8f6f0d81ee3a/output/arm64-apple-darwin/bitcoin-8f6f0d81ee3a-arm64-apple-darwin.tar.gz
  726d2671bbed2355c083b8516faa5d8e0422fab6cb38a135f68ee011f9e09af5  guix-build-8f6f0d81ee3a/output/dist-archive/bitcoin-8f6f0d81ee3a.tar.gz
  955fff1c9998bb04bcf1afe9b467590960206e9c512b3446ecdd701e251bb419  guix-build-8f6f0d81ee3a/output/powerpc64-linux-gnu/SHA256SUMS.part
  e95cdeda727d641c002755c4a3e3b69049a35f1bff4867ac14320585d65595c4  guix-build-8f6f0d81ee3a/output/powerpc64-linux-gnu/bitcoin-8f6f0d81ee3a-powerpc64-linux-gnu-debug.tar.gz
  21bda341cd8af44bc731cf7e3637322a92032e7a956acdde25ea6e59989c67b9  guix-build-8f6f0d81ee3a/output/powerpc64-linux-gnu/bitcoin-8f6f0d81ee3a-powerpc64-linux-gnu.tar.gz
  6f90c38998696f61c373c3546bcc03e6b5ecfbe3b9fec9a7c75d601b3175b698  guix-build-8f6f0d81ee3a/output/powerpc64le-linux-gnu/SHA256SUMS.part
  7166c2354b8777464bf8c5c3d7e4a171d00b5e0617635fa8b12c4d47ad619e84  guix-build-8f6f0d81ee3a/output/powerpc64le-linux-gnu/bitcoin-8f6f0d81ee3a-powerpc64le-linux-gnu-debug.tar.gz
  8c879a3ae9fefc1071d0b6ea3b0cf858295386860b10079b472b526abfdcd2b5  guix-build-8f6f0d81ee3a/output/powerpc64le-linux-gnu/bitcoin-8f6f0d81ee3a-powerpc64le-linux-gnu.tar.gz
  7dc7153d3c180308d873cb20320e8a6221cec81d8018da85683870168380eef7  guix-build-8f6f0d81ee3a/output/riscv64-linux-gnu/SHA256SUMS.part
  c37b79e33b9a318d3acee9114cdf057ee518abaa09736bd63e015d924d2c3ffb  guix-build-8f6f0d81ee3a/output/riscv64-linux-gnu/bitcoin-8f6f0d81ee3a-riscv64-linux-gnu-debug.tar.gz
  d25abfb09d12e74bffd7f42e95eba211317acefa4718dbea27055d905f5b6999  guix-build-8f6f0d81ee3a/output/riscv64-linux-gnu/bitcoin-8f6f0d81ee3a-riscv64-linux-gnu.tar.gz
  5ffc5c97012d8ae85cb56e635760029b774ea4f57a64e41cd4bdade4ed93e619  guix-build-8f6f0d81ee3a/output/x86_64-apple-darwin/SHA256SUMS.part
  ecf96275016e82af2c1a4842578feac286de9db8b7f5e4266cf877cb29da1da8  guix-build-8f6f0d81ee3a/output/x86_64-apple-darwin/bitcoin-8f6f0d81ee3a-x86_64-apple-darwin-unsigned.dmg
  50bee378ed88471dc326730564ca24cea2625ce1477b82881cda572f0a8913cc  guix-build-8f6f0d81ee3a/output/x86_64-apple-darwin/bitcoin-8f6f0d81ee3a-x86_64-apple-darwin-unsigned.tar.gz
  f4215a018f18e3639c50f10909af3ceff6982abf8b292fd88fa5d690b06d704a  guix-build-8f6f0d81ee3a/output/x86_64-apple-darwin/bitcoin-8f6f0d81ee3a-x86_64-apple-darwin.tar.gz
  ee5278c8afc7ead80853aff69c1bbd624ef078428076f0e92b0ad35931036b3f  guix-build-8f6f0d81ee3a/output/x86_64-linux-gnu/SHA256SUMS.part
  daed3889107ffe8b3ec2c59abff93d4b92a4dff382457485d29489a0e9421965  guix-build-8f6f0d81ee3a/output/x86_64-linux-gnu/bitcoin-8f6f0d81ee3a-x86_64-linux-gnu-debug.tar.gz
  f1acd6b1d296f2de5ff838fe3fb82035f2774485b06678ecdd461e631ebbe092  guix-build-8f6f0d81ee3a/output/x86_64-linux-gnu/bitcoin-8f6f0d81ee3a-x86_64-linux-gnu.tar.gz
  3e9f9f92e4de995c9029f17962c33e317f7000df9c1afa2a447b65ac98c27f4b  guix-build-8f6f0d81ee3a/output/x86_64-w64-mingw32/SHA256SUMS.part
  4b50a73917450770c793bfc787a6785c7389ce02bd25368db9a1445da07bb7b1  guix-build-8f6f0d81ee3a/output/x86_64-w64-mingw32/bitcoin-8f6f0d81ee3a-win64-debug.zip
  832ddec19b8c5698cc3497f93fc59f0f72b0d7a3f313d46c2c1c52b5badf19fd  guix-build-8f6f0d81ee3a/output/x86_64-w64-mingw32/bitcoin-8f6f0d81ee3a-win64-setup-unsigned.exe
  d9bc2dabd0cff8e9ee6ccb309bee34a6faa1298771c0cc9bff8f948d34ec047e  guix-build-8f6f0d81ee3a/output/x86_64-w64-mingw32/bitcoin-8f6f0d81ee3a-win64-unsigned.tar.gz
  55cc5607d3fdf113fde463d87c5dd895c305ba0313e56bba1b0875a8a78c65a7  guix-build-8f6f0d81ee3a/output/x86_64-w64-mingw32/bitcoin-8f6f0d81ee3a-win64.zip
  ```

ACKs for top commit:
  hebasto:
    ACK 8f6f0d81ee3a9ea582e9c9cf986613da86760098

Tree-SHA512: f6fd4b9ed37ad93c7a5df4ca17f1ae5b8705f5dc4a377c8e01c6376b1818980534a233a08f2a20c4ff851a25f660ebb89c7416b93f6f039747194661b00c75ed

1 files changed, 0 insertions, 2 deletions

diff --git a/configure.ac b/configure.ac
index 912201696b..9e3a7cca8a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -919,8 +919,6 @@ if test "$ac_cv_sys_large_files" != "" &&
   CORE_CPPFLAGS="$CORE_CPPFLAGS -D_LARGE_FILES=$ac_cv_sys_large_files"
 fi
 
-AC_SEARCH_LIBS([clock_gettime],[rt])
-
 if test "$enable_gprof" = "yes"; then
     dnl -pg is incompatible with -pie. Since hardening and profiling together doesn't make sense,
     dnl we simply make them mutually exclusive here. Additionally, hardened toolchains may force