Enhance python detection. Several OS do not include a python-config script (e.g. Centos, Fedora, OpenSolaris), so use the distutils module directly (like python-config does) to extract the required information. I am keeping the python-config support for now (used when distutils is not found). Several minor cleanups of the code too...

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@8450 d0543943-73ff-0310-b7d9-9358b9ac24b2