[issue1294959] Add sys.platlibdir to use /usr/lib64 on Fedora and SuSE

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Miro Hrončok ran rpmdiff to compare the Fedora with the old downstream patches and with the new upstream commit 8510f430781118d9b603c3a2f06945d6ebc5fe42: compare the Python package with and without setup.py changes.

https://src.fedoraproject.org/rpms/python39/pull-request/31#comment-39392

In short, there is no difference. Moreover, Miro Hrončok, Matej Cepl and me don't know the rationale of these setup.py changes.

I propose to drop them and wait until someone complains. If someone complains, we would know the rationale and so have a good reason to have these setup.py changes.

For readline: Fedora libreadline is already linked to libtinfo and so setup.py doesn't go up to `self.compiler.find_library_file(self.lib_dirs + ['/usr/lib/termcap'], 'termcap')` code path. This code is deadcode on Fedora.

For /usr/local/lib vs /usr/local/lib64: I'm not sure why /usr/local/lib is used in the first place. Fedora installs libraries in /usr, not in /usr/local. Maybe it's there for users who install dependencies without Fedora: by installed them manually in /usr/local. Again, since it's unclear how /usr/local is supposed to be used, I prefer to leave it unchanged.

I closed the PR 18917.

Morevoer, if it becomes an issue in Fedora, we can start with a downstream patch again, to see how it goes, before going directly upstream.

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