c49b0405fb
5bff18bce5d9d8bd1bae0cb89facf73c829c947b guix: patch gcc 10 with pthreads to remap guix store paths (Andrew Chow)
Pull request description:
The only thing preventing windows from being cross architecture reproducible is a single guix store winpthreads path in the debug symbols. This can be removed by patching libgcc to use `-ffile-prefix-map` so that the debug symbol will be mapped to a fixed `/usr` instead of the guix store path which depends on the building architecture.
x86_64
```
2e585c4a66e930b5e273e89b8aeddc9c3bd1c8375b19d988a6fff64f0d49edfd guix-build-5bff18bce5d9/output/dist-archive/bitcoin-5bff18bce5d9.tar.gz
b9235dc1a8541e840231cfafd0d971bd5e8a3ea7d5331c4d7af9dbfdabc6905b guix-build-5bff18bce5d9/output/x86_64-w64-mingw32/SHA256SUMS.part
f82d861de60e22fc7dd731bef60a3e4399b5317eb16e41e92ded171490d1a578 guix-build-5bff18bce5d9/output/x86_64-w64-mingw32/bitcoin-5bff18bce5d9-win64-debug.zip
bfd59561c3cfce91b09d05b17cfc67cd70cb78eea39ea863119870260a8dbdec guix-build-5bff18bce5d9/output/x86_64-w64-mingw32/bitcoin-5bff18bce5d9-win64-setup-unsigned.exe
3d049d98c6add13b0eb4c7adcf0d3ae59d1eab09799292a2c900de0ad067912a guix-build-5bff18bce5d9/output/x86_64-w64-mingw32/bitcoin-5bff18bce5d9-win64-unsigned.tar.gz
7af4c34c47f349028ec1f4c2edea547bd9fa30d1c67977d482607a9c6bf2ddee guix-build-5bff18bce5d9/output/x86_64-w64-mingw32/bitcoin-5bff18bce5d9-win64.zip
```
arm64
```
2e585c4a66e930b5e273e89b8aeddc9c3bd1c8375b19d988a6fff64f0d49edfd guix-build-5bff18bce5d9/output/dist-archive/bitcoin-5bff18bce5d9.tar.gz
b9235dc1a8541e840231cfafd0d971bd5e8a3ea7d5331c4d7af9dbfdabc6905b guix-build-5bff18bce5d9/output/x86_64-w64-mingw32/SHA256SUMS.part
f82d861de60e22fc7dd731bef60a3e4399b5317eb16e41e92ded171490d1a578 guix-build-5bff18bce5d9/output/x86_64-w64-mingw32/bitcoin-5bff18bce5d9-win64-debug.zip
bfd59561c3cfce91b09d05b17cfc67cd70cb78eea39ea863119870260a8dbdec guix-build-5bff18bce5d9/output/x86_64-w64-mingw32/bitcoin-5bff18bce5d9-win64-setup-unsigned.exe
3d049d98c6add13b0eb4c7adcf0d3ae59d1eab09799292a2c900de0ad067912a guix-build-5bff18bce5d9/output/x86_64-w64-mingw32/bitcoin-5bff18bce5d9-win64-unsigned.tar.gz
7af4c34c47f349028ec1f4c2edea547bd9fa30d1c67977d482607a9c6bf2ddee guix-build-5bff18bce5d9/output/x86_64-w64-mingw32/bitcoin-5bff18bce5d9-win64.zip
```
ACKs for top commit:
fanquake:
ACK 5bff18bce5d9d8bd1bae0cb89facf73c829c947b
hebasto:
ACK 5bff18bce5d9d8bd1bae0cb89facf73c829c947b, I have reviewed the code and it looks OK. Confirming reproducibility for `x86_64` and `arm64` platforms.
Tree-SHA512: 7cc34e6348e4cab847a7b8745179fceced0f37d639cf2ae81748dd73820809ea8f5e049b5b3ce2b912528491967e33fafd56e75aa47714e09b41859091433c5d
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