python,python3: Record PKG_RELEASE for host setuptools/pip

python,python3: Record PKG_RELEASE for host setuptools/pip

This changes the "patched" indicator files for host setuptools and pip
to include their PKG_RELEASE values. This also removes host setuptools
and/or pip before host install, if the installed copy does not match the
version (and PKG_RELEASE) of the copy to be installed.

This will allow added or removed patches to affect host setuptools /
pip, since these changes will cause PKG_RELEASE to be incremented.

This also fixes the host install error, when the install tries to patch
an already patched copy of setuptools. (This error occurs because the
existing indicator files do not have version numbers in their file
names, whereas host install expected version numbers to be present.)

Signed-off-by: Jeffery To <redacted>