Supporting multiple python runtimes with automake

[Yuval Turgeman]

Hi,

I added 2 macros (AM_PATH_PYTHON2 and AM_PATH_PYTHON3) to support both
python2 and python3 on the same system.  It works in the same way that
AM_PATH_PYTHON works (just a small wrapper around it).  Please notice that
AM_PATH_PYTHON and AM_PATH_PYTHONx can't be called together.

The motive for doing this is Fedora Packaging Guidelines for Python (
https://fedoraproject.org/wiki/Packaging:Python) which requires a package
to be built for both runtimes.

Thanks,
Yuval.

0001-python.m4-supporing-multiple-python-runtimes.patch
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