Merge bitcoin/bitcoin#21654: build, qt: Make Qt rcc output always deterministic

a58868d201cb6d263aa552815f7f86562c1ca9a5 build: Makes rcc output always deterministic (Hennadii Stepanov)

Pull request description:

  The Qt Resource Compiler ([rcc](https://doc.qt.io/qt-5/rcc.html)) has a command-line option `--format-version` which has the [default value](https://code.qt.io/cgit/qt/qtbase.git/tree/src/tools/rcc/main.cpp?h=5.12.10#n172) 2.

  The only difference from `--format-version 1` is adding a [last modified timestamp](https://code.qt.io/cgit/qt/qtbase.git/tree/src/tools/rcc/rcc.cpp?h=5.12.10#n207) to the output file ([credits](https://github.com/bitcoin/bitcoin/pull/21654#issuecomment-819198228) to **fanquake**). That, in turn, forces us to use `QT_RCC_SOURCE_DATE_OVERRIDE=1` to get deterministic builds (#13732).

  This change makes rcc output always deterministic by using `--format-version 1` option that makes usage of the
  `QT_RCC_SOURCE_DATE_OVERRIDE` needless.

  ---

  Also it improves interaction with ccache:

  On master (f6c44e999b7d1d9a0de5d678ac8f1679aa271f65):
  ```
  $ make && make clean && ccache --zero-stats && make && ccache --show-stats
  ...
  cache directory                     /home/hebasto/.ccache
  primary config                      /home/hebasto/.ccache/ccache.conf
  secondary config      (readonly)    /etc/ccache.conf
  stats updated                       Sun Apr 11 15:45:43 2021
  stats zeroed                        Sun Apr 11 15:45:05 2021
  cache hit (direct)                   638
  cache hit (preprocessed)               0
  cache miss                             1
  cache hit rate                     99.84 %
  called for link                       10
  cleanups performed                     0
  files in cache                     20023
  cache size                          13.2 GB
  max cache size                      15.0 GB
  ```

  The missed file is always `qt/libbitcoinqt_a-qrc_bitcoin_locale.o`.

  With this PR:
  ```
  $ make && make clean && ccache --zero-stats && make && ccache --show-stats
  ...
  cache directory                     /home/hebasto/.ccache
  primary config                      /home/hebasto/.ccache/ccache.conf
  secondary config      (readonly)    /etc/ccache.conf
  stats updated                       Sun Apr 11 15:28:46 2021
  stats zeroed                        Sun Apr 11 15:28:21 2021
  cache hit (direct)                   639
  cache hit (preprocessed)               0
  cache miss                             0
  cache hit rate                    100.00 %
  called for link                       10
  cleanups performed                     0
  files in cache                     20012
  cache size                          13.2 GB
  max cache size                      15.0 GB
  ```

ACKs for top commit:
  fanquake:
    ACK a58868d201cb6d263aa552815f7f86562c1ca9a5

Tree-SHA512: 52f4a3267f41883d13025c0de79b6da22e92d60c729e01b986935c6812bbfe7fadc40b742bd715bfdf09df94af6838d4fbbe8208c6123f366108e38c8e1121c5

1 files changed, 0 insertions, 1 deletions

diff --git a/contrib/gitian-descriptors/gitian-osx.yml b/contrib/gitian-descriptors/gitian-osx.yml
index d6c41b2c43..1d4506e3c2 100644
--- a/contrib/gitian-descriptors/gitian-osx.yml
+++ b/contrib/gitian-descriptors/gitian-osx.yml
@@ -42,7 +42,6 @@ script: |
   FAKETIME_HOST_PROGS=""
   FAKETIME_PROGS="ar ranlib date dmg xorrisofs"
 
-  export QT_RCC_SOURCE_DATE_OVERRIDE=1
   export TZ="UTC"
   export BUILD_DIR="$PWD"
   mkdir -p ${WRAP_DIR}