Added a more informative error message if the platform module is missing.
This is for Python <= 2.2. The file from http://hg.python.org/cpython/file/2.3/Lib/platform.py can simply be copied into the lib/pythonX.X/ directory to fix this.
Authored by: bugman 2013-03-12
Parent: [r18800]
Child: [r18802]