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The situation:
Python <3.11: under Linux the abi string is always -gnu*
Python 3.11-3.12: musl is treated as its own abi in the python build system, but when cross-compiling the build host's libc is used for the target abi string. Cross compiling from glibc to musl gives a -gnu* target abi string and vice versa.
Python >=3.13: musl is treated as its own abi, and when cross-compiling the target libc is used for the target abi string
We backport the fix for python 3.11-3.12, since the intermediate state is almost impossible to model in the nix expression
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