Merge #20644: Add patch to make codesign_allocate compatible with Apple's

a4118c6e200e02e7560f8bc213697aa2909d95b1 Add patch to make codesign_allocate compatible with Apple's (Pieter Wuille)

Pull request description:

  This is an alternative to #20638.

  The problem is that Apple's codesign(_allocate) apparently rounds the "vmsize" attribute on the __LINKEDIT section to a multiple of 0x2000 on x86_64 rather than 0x1000 (as their published source code does). This divergence means that the binary signed by codesign is slightly different from the one recreated by our reattach-sig-to-gitian-output process, and the signature being invalid.

  This fixes it by patching our codesign_allocate source code to also use 0x2000. In tests, this appears to result in matching binaries.

ACKs for top commit:
  jonasschnelli:
    Tested ACK a4118c6e200e02e7560f8bc213697aa2909d95b1 - removed the osx cache, built commit a4118c6e200e02e7560f8bc213697aa2909d95b1 for osx in gitian (dependency where built, patch was applied), signed on my signing mac (detach-sig-create), ran gitian osx signer with the produces signature and the a4118c6e200e02e7560f8bc213697aa2909d95b1 build (detach-sig-apply), signature then was successful verified on my Mac (codesign -v /Volumes/Bitcoin-Core/Bitcoin-Qt.app)
  MarcoFalke:
    Concept ACK a4118c6e200e02e7560f8bc213697aa2909d95b1

Tree-SHA512: 07b8cdf8216249ddfe4bd38b39f2b48b2e190d4002b84d8981e62197bbbc9f25ac5c137bcc32057b23fbf38cbb2889ef95101ce008edfbf608cd170b88b3acbc

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