Respect the libc of the execution environment with uv python list

[Di-Is]

Fix #4988

Summary

Running uv python list on glibc-based Linux will list musl pythons.

$ uv version
uv 0.2.24
$ uv python list
warning: `uv python list` is experimental and may change without warning.
cpython-3.12.3-linux-x86_64-musl     <download available>
cpython-3.12.3-linux-x86_64-gnu      /usr/bin/python3
cpython-3.12.3-linux-x86_64-gnu      /bin/python3
cpython-3.11.9-linux-x86_64-musl     <download available>
cpython-3.10.14-linux-x86_64-musl    <download available>
cpython-3.9.19-linux-x86_64-musl     <download available>
cpython-3.8.19-linux-x86_64-musl     <download available>
cpython-3.7.9-linux-x86_64-musl      <download available>

Change it to show Python matching the environment's libc as follows.

$ uv python list
warning: `uv python list` is experimental and may change without warning.
cpython-3.12.3-linux-x86_64-gnu     /usr/bin/python3
cpython-3.12.3-linux-x86_64-gnu     /bin/python3
cpython-3.12.3-linux-x86_64-gnu     <download available>
cpython-3.11.9-linux-x86_64-gnu     <download available>
cpython-3.10.14-linux-x86_64-gnu    <download available>
cpython-3.9.19-linux-x86_64-gnu     <download available>
cpython-3.8.19-linux-x86_64-gnu     <download available>
cpython-3.7.9-linux-x86_64-gnu      <download available>

Also, if --all-platforms is specified, change to list Python for all architectures and libc.

$ uv python list --all-platforms
warning: `uv python list` is experimental and may change without warning.
cpython-3.12.3-windows-x86_64-none       <download available>
cpython-3.12.3-windows-x86-none          <download available>
cpython-3.12.3-macos-x86_64-none         <download available>
cpython-3.12.3-macos-aarch64-none        <download available>
cpython-3.12.3-linux-x86_64-musl         <download available>
cpython-3.12.3-linux-x86_64-gnu          /usr/bin/python3
cpython-3.12.3-linux-x86_64-gnu          /bin/python3
cpython-3.12.3-linux-x86_64-gnu          <download available>
cpython-3.12.3-linux-s390x-gnu           <download available>
cpython-3.12.3-linux-powerpc64le-gnu     <download available>
cpython-3.12.3-linux-armv7-gnueabihf     <download available>
cpython-3.12.3-linux-armv7-gnueabi       <download available>
cpython-3.12.3-linux-aarch64-gnu         <download available>
...

Test Plan

The following commands were executed on the command line to confirm the results in Ubuntu 24.04.

• cargo run python list
• cargo run python list --all-platforms

[zanieb]

Thank you! Note we don't have proper musl detection yet (see #4160 and #4242)

[Di-Is]

Hi @zanieb!

I see, the function to detect the type of libc has not been implemented yet.
Since various conflicts are likely to occur, we will not make any changes to this MR for now.

I hope that the problem reported in #4988 will be fixed somehow.

[zanieb]

I think this is an improvement regardless of our detection abilities, thank you!