[3.13] gh-120291: Fix a bashism in python-config.sh.in (GH-120292) (#120341)

gh-120291: Fix a bashism in python-config.sh.in (GH-120292)

gh-120291: Fix bashisms in python-config.sh.in

Replace the use of bash-specific `[[ ... ]]` with POSIX-compliant
`[ ... ]` to make the `python-config` shell script work with non-bash
shells again.  While at it, use `local` in a safer way, since it is
not in POSIX either (though universally supported).

Fixes GH-120291
(cherry picked from commit 7d2447137e117ea9a6ee1493bce0b071c76b1bd7)

Co-authored-by: Michał Górny <mgorny@gentoo.org>