Merge bitcoin/bitcoin#25817: build: fix cross-arch macOS M1 build reproducibility

08bd338277 build: optimise arm64 darwin qt build using -O1 (fanquake)

Pull request description:

  Building the macOS M1 bitcoin-qt binary at a optimisation level higher than `-O1` causes reproducibility issues when building on different architectures.

  Proposing somewhat of a hammer.

  This would fix 1 of the 2 remaining HOSTS in #21194.

  Guix Build (x86_64):
  ```bash
  1b58b5109b32dca2509499c93347148e6bab5dca835081f8cbd3123bed72cce1  guix-build-08bd3382777b/output/arm64-apple-darwin/SHA256SUMS.part
  0e0d063d3832fad7c5116dabb2ac33c919f40bda04759aad4523c6247295bc9e  guix-build-08bd3382777b/output/arm64-apple-darwin/bitcoin-08bd3382777b-arm64-apple-darwin-unsigned.dmg
  1feb301245f2c664edcfd9ac528fe1543fc7b183b3b42637db77d57658bc2b5e  guix-build-08bd3382777b/output/arm64-apple-darwin/bitcoin-08bd3382777b-arm64-apple-darwin-unsigned.tar.gz
  641eb100d0a281203f9d6e36e45dc0ffc772c680d6aec462434f106b4c44e295  guix-build-08bd3382777b/output/arm64-apple-darwin/bitcoin-08bd3382777b-arm64-apple-darwin.tar.gz
  9d89920626e35939aa6cf506fc85861179f3c0e18d4ef1954750cf81336a851a  guix-build-08bd3382777b/output/dist-archive/bitcoin-08bd3382777b.tar.gz
  e7697d30084270d0b5843b3baf0d752e240c2f708f728bc2f6896f153276ca6b  guix-build-08bd3382777b/output/x86_64-apple-darwin/SHA256SUMS.part
  dd77acee082dbfd3cdad2c564bbd3bdace8df9bf32f92cf4a2debd5a996ace49  guix-build-08bd3382777b/output/x86_64-apple-darwin/bitcoin-08bd3382777b-x86_64-apple-darwin-unsigned.dmg
  85e63fccb7af12468a04a678034c42dcd775d243b2d194a52e1086a6ffbdbe84  guix-build-08bd3382777b/output/x86_64-apple-darwin/bitcoin-08bd3382777b-x86_64-apple-darwin-unsigned.tar.gz
  ff2629957608898d76a42025985e3ec4bf5dc8572794e32b4182ba6f8babb828  guix-build-08bd3382777b/output/x86_64-apple-darwin/bitcoin-08bd3382777b-x86_64-apple-darwin.tar.gz
  ```

  Guix Build (arm64):
  ```bash
  1b58b5109b32dca2509499c93347148e6bab5dca835081f8cbd3123bed72cce1  guix-build-08bd3382777b/output/arm64-apple-darwin/SHA256SUMS.part
  0e0d063d3832fad7c5116dabb2ac33c919f40bda04759aad4523c6247295bc9e  guix-build-08bd3382777b/output/arm64-apple-darwin/bitcoin-08bd3382777b-arm64-apple-darwin-unsigned.dmg
  1feb301245f2c664edcfd9ac528fe1543fc7b183b3b42637db77d57658bc2b5e  guix-build-08bd3382777b/output/arm64-apple-darwin/bitcoin-08bd3382777b-arm64-apple-darwin-unsigned.tar.gz
  641eb100d0a281203f9d6e36e45dc0ffc772c680d6aec462434f106b4c44e295  guix-build-08bd3382777b/output/arm64-apple-darwin/bitcoin-08bd3382777b-arm64-apple-darwin.tar.gz
  9d89920626e35939aa6cf506fc85861179f3c0e18d4ef1954750cf81336a851a  guix-build-08bd3382777b/output/dist-archive/bitcoin-08bd3382777b.tar.gz
  e7697d30084270d0b5843b3baf0d752e240c2f708f728bc2f6896f153276ca6b  guix-build-08bd3382777b/output/x86_64-apple-darwin/SHA256SUMS.part
  dd77acee082dbfd3cdad2c564bbd3bdace8df9bf32f92cf4a2debd5a996ace49  guix-build-08bd3382777b/output/x86_64-apple-darwin/bitcoin-08bd3382777b-x86_64-apple-darwin-unsigned.dmg
  85e63fccb7af12468a04a678034c42dcd775d243b2d194a52e1086a6ffbdbe84  guix-build-08bd3382777b/output/x86_64-apple-darwin/bitcoin-08bd3382777b-x86_64-apple-darwin-unsigned.tar.gz
  ff2629957608898d76a42025985e3ec4bf5dc8572794e32b4182ba6f8babb828  guix-build-08bd3382777b/output/x86_64-apple-darwin/bitcoin-08bd3382777b-x86_64-apple-darwin.tar.gz
  ```

ACKs for top commit:
  hebasto:
    ACK 08bd338277
  jarolrod:
    ACK 08bd338277

Tree-SHA512: 48da4acb1799c3153cdaf674f287c81c3da230a3476183616b74f318baa595af45b313136eb228ba13c63e0b8206a78064734f9fd0488e1e839c9e4e1d92ba25

depends/packages/qt.mk

@@ -131,6 +131,9 @@ $(package)_config_opts_darwin += -no-feature-corewlan
 $(package)_config_opts_darwin += -no-freetype
 $(package)_config_opts_darwin += QMAKE_MACOSX_DEPLOYMENT_TARGET=$(OSX_MIN_VERSION)
 
+# Optimizing using > -O1 causes non-determinism when building across arches.
+$(package)_config_opts_aarch64_darwin += "QMAKE_CFLAGS_OPTIMIZE_FULL = -O1"
+
 ifneq ($(build_os),darwin)
 $(package)_config_opts_darwin += -xplatform macx-clang-linux
 $(package)_config_opts_darwin += -device-option MAC_SDK_PATH=$(OSX_SDK)