On windows, ensure python module are located in "Lib" folder.

This is required by the code associated to the 'get_python_lib' function
in Lib/distutils/sysconfig.py

Considering that the function 'get_python_lib' is used when building
external package like Numpy, it is particularly important to be compliant
with the file organization imposed by the implementation of the 'get_python_lib'
function.
Merge branch 'tweak-lib-location-for-win32'

* tweak-lib-location-for-win32:
  On windows, ensure python module are located in "Lib" folder.