pkg-config --version prints extra debugging cruft

[mattip]

meson-python uses pkg-config --version to detect a valid pkg-config. When running that I see

$ pkg-config --version
> Running the Python pkgconf [INFO:pkgconf.cli]
> $ 'PKG_CONFIG_PATH='"'"''"'"'' /tmp/venv313/lib/python3.13/site-packages/pkgconf/.bin/pkgconf --version [INFO:pkgconf.cli]
2.5.1

Even though the extra lines goes to stderr it could possibly mess up some parsers. Is it necessary to log that info?

xref numpy/numpy#26574 (comment)

[virtuald]

I use it with meson and it doesn't complain.

I'm not opposed to not logging by default (maybe PYPI_PKGCONF_DEBUG=1) though if @FFY00 doesn't mind.

[FFY00]

I think that's fine 👍