[BAD] Automatic PR for 1ca36ea7-5c3b-4d9b-80f1-4180c6781e07

[code-narrator]

The PR was created automatically by CodeNarrator. The following issues were fixed:
BLD: improvements to meson.build files (pandas-dev#54949)

• BLD: some changes to make meson.build more idiomatic

• Use pure: false only in a single place. This is recommended for
  robustness, this way you can't forget it in a subdirectory and end up
  with a subtly broken package only on niche Linux distros that split
  purelib and platlib directories.
• Use py.install_sources with a list input rather than in a foreach
  loop.
• Remove the werror comment: it's never a good idea to enable
  -Werror by default in the build config of a library, that can easily
  break builds. This should be done in one or more CI jobs instead.

• BLD: run generate_version.py with a shebang, not 'python'

The way this was before can result in build failures. It assumed that
python is a working Python 3.x interpreter, and that is not always
true. See for example this bug report for the exact same thing in
NumPy, where python isn't working for Sage:
numpy/numpy#24514

Meson guarantees that .py scripts with a shebang on the top line will
be run with a Python interpreter (if there's none on the PATH, it can
use the one Meson itself is run with). Hence this is the most robust
way of using run_command on a .py script.
Corresponding commit hash: 3334832