libdir and python on x86_64

[Shahms E. King]

Use the python_sitearch or python_sitelib defines:
%{!?python_sitearch: %define python_sitearch %(%{__python} -c "from 
distutils.sysconfig import get_python_lib; print get_python_lib(1)")}

%{!?python_sitelib: %define python_sitelib %(%{__python} -c "from 
distutils.sysconfig import get_python_lib; print get_python_lib()")}

Pick the appropriate one, put it at the top of the specfile, and use 
that rather than %{_libdir}.  There's more information in the wiki. 
These are also defined in the python spec template in fedora-rpmdevtools.

--Shahms