guix: Use UCRT runtime for Windows release binaries #33593

1. 
   hebasto commented at 9:46 pm on October 9, 2025: member

   This PR switches Windows release binaries to UCRT and resolves one item from #30210:

   • A symbol-check that the new runtime is indeed being used.

   Guix builds on both x86_64 and aarch64 platforms:

   0b8df1d6c3bf2a4342aa19385444b221503eec2faed8656645e656fc60c1563a0  guix-build-f380e6251021/output/dist-archive/bitcoin-f380e6251021.tar.gz
   13c57789c22a0670b1395f25bab2b5951d58b3cef57d33d48c93b1f51b0ca21d9  guix-build-f380e6251021/output/x86_64-w64-mingw32/SHA256SUMS.part
   2518593a55138291625abb7f53825701bce2f5ded6d659036d7ec79fb6a550ee5  guix-build-f380e6251021/output/x86_64-w64-mingw32/bitcoin-f380e6251021-win64-codesigning.tar.gz
   3155b33418f5b1958b19171768d5410f544b371621ba0046e6b2b6806aff40419  guix-build-f380e6251021/output/x86_64-w64-mingw32/bitcoin-f380e6251021-win64-debug.zip
   443862f64f1fa2918c41c6e7f6a69a0b85d70512ea0b002d783c613642876b83a  guix-build-f380e6251021/output/x86_64-w64-mingw32/bitcoin-f380e6251021-win64-setup-unsigned.exe
   5ac16d1f89a36bb425ff7dc36bd319fe464f032c1d21d298328aec9ebddfa8b77  guix-build-f380e6251021/output/x86_64-w64-mingw32/bitcoin-f380e6251021-win64-unsigned.zip
   

2. guix: Use UCRT runtime for Windows release binaries f380e62510
3. hebasto added the label Build system on Oct 9, 2025
4. 
   DrahtBot commented at 9:46 pm on October 9, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/33593.

   Reviews

   See the guideline for information on the review process. A summary of reviews will appear here.

Contributors
hebasto DrahtBot maflcko

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Build system