Tweak generated Makefile to match one generated by regular python build

To ensure the Makefile is also properly generated on a given platform,
a small script named "confall.py" has been created:

   See https://gist.github.com/jcfr/5111758

The config dump generated by confall.py for both an installed tree obtain
using a autoconf system or a CMake system can easily be compared to
further tune the Makefile configuration.

Having the Makefile properly configured seems rather critical to allow
dependent package to be build properly:
  http://bugs.python.org/issue3588
  http://bugs.python.org/issue16848