This fixes the build with "make PYTHON=python2" on systems where python
is python3.
For PYLIBVER and PYTHONLIBDIR definitions, I tested Python 2.5, 2.6, 2.7,
3.3 and 3.4. For each of them, these commands print the expected result:
python -c 'import sys;print("python%d.%d" % sys.version_info[0:2])'"
python -c "from distutils.sysconfig import *;print(get_python_lib(1))"
Acked-by: Steve Lawrence <slawrence@tresys.com>
e4d693ae87