Update deps and build instructions wrt. libmpdecimal

[erlend-aasland]

• Unvendor libmpdec sources cpython#115119

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📚 Documentation preview 📚: https://cpython-devguide--1313.org.readthedocs.build/

[ned-deily]

LGTM, although, once we change the configure default for --with-system-libmpdec there really wouldn't need to be a separate recipe for 3.13, as long as people didn't care which version of libmpdec is being used.

[erlend-aasland]

Thanks for the review!

LGTM, although, once we change the configure default for --with-system-libmpdec there really wouldn't need to be a separate recipe for 3.13, [...]

Yep.

[...] as long as people didn't care which version of libmpdec is being used.

I don't think the devguide recipe is the place for that user group; for people who care about a particular version of a build dependency, we have https://docs.python.org/3/using/configure.html ¹.

Footnotes

1. ... and in this particular case, it is https://docs.python.org/3.13/using/configure.html#cmdoption-with-system-libmpdec ↩