select the correct meson_command for pyinstaller builds, even on not-Windows

We have previously updated the python_command handling to correctly
detect PyInstaller builds without assuming that it is only Windows, back
in commit c39ee881a1959ae37aded8e0c24cec23b2bd6a90. But the fix was
incomplete. This affects e.g. running --internal scripts such as
symbolextractor.

The issue in this case is slightly more subtle. While sys.executable
won't be a valid python so it intuitively falls over quite badly when
trying to run it as one, getting the original command is broken in a
more interesting way. PyInstaller sets `sys.argv[0]` to the basename of
the executable, which then got absolutized to a nonexistent file in the
current working directory.

Fixes: https://github.com/mesonbuild/meson/issues/14412

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