Allow to import pip10's main from pip9's /usr/bin/pip
Users are upgrading pip9 to pip10 by various manners,
one of them is `pip install --user --upgrade pip`.
If they do that and they run `pip` or `pip3`, the one from /usr/bin is used.
However that's the one from this RPM package (pip9) and the import in there
fails (it tries to import from ~/.local, but pip10 is there with a bit
We add a patch as a dirty workaround to make /usr/bin/pip* work with
both pip9 (from this RPM) and pip10 (from whatever).
A proper fix is to put ~/.local/bin in front of /usr/bin in the PATH,
however others are against that and we cannot change it for existing
installs/user homes anyway.
This is a workaround for:
Patch is applied in %install, because /usr/bin/pip* are entrypoints.