Merge #18297: build: Use pkg-config in BITCOIN_QT_CONFIGURE for all hosts including Windows

8a26848c460160e1279f26bc413f693a34e33b9d build: Fix m4 escaping (Hennadii Stepanov)
9123ec15db104397998f5084afc69403d2f9e4b8 build: Remove extra tokens warning (Hennadii Stepanov)
fded4f48c33742d7c790335c8de59c15b80d94e6 build: Remove duplicated QT_STATICPLUGIN define (Hennadii Stepanov)
05a93d5d96101b45d87571af5b772c7a1e82fd27 build: Fix indentation in bitcoin_qt.m4 (Hennadii Stepanov)
ddbb41931019ed4226af3df37874c7eb7cf570f1 build: Use pkg-config in BITCOIN_QT_CONFIGURE for all hosts (Hennadii Stepanov)
492971de35bab26346545f68365872211f458b00 build: Fix mingw pkgconfig file and dependency naming (Hennadii Stepanov)

Pull request description:

  This PR makes `bitcoin_qt.m4` to use `pkg-config` for all hosts and removes non-pkg-config paths from it. This is a step towards the idea which was clear [stated](https://github.com/bitcoin/bitcoin/pull/8314#issue-76644643) by Cory Fields:
  > I believe the consensus is to treat Windows like the others and require pkg-config across the board. We can drop all of the non-pkg-config paths, and simply AC_REQUIRE(PKG_PROG_PKG_CONFIG)

  There are two unsolved problems with this PR. If depends is built with `DEBUG=1` the `configure` script fails to pickup Qt:
  - for macOS host (similar to, but not the same as #16391)
  - for Windows host (regression)

  The fix is ~on its way~ submitted in #18298 (as a followup).

  Also this PR picks some small improvements from #17820.

ACKs for top commit:
  theuni:
    Code review ACK 8a26848c460160e1279f26bc413f693a34e33b9d
  dongcarl:
    Code Review ACK 8a26848c460160e1279f26bc413f693a34e33b9d
  laanwj:
    Code review ACK 8a26848c460160e1279f26bc413f693a34e33b9d

Tree-SHA512: 3b25990934b939121983df7707997b31d61063b1207d909f539d69494c7cb85212f353092956d09ecffebb9fef28b869914dd1216a596d102fcb9744bb5487f7

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