Add modules_config.c

Add modules_config.c

This file is copied from a './Modules/config.c' of a Linux build and it contains
the modules init functions and their registration as Python extensions. We
commented the registration of the modules that we do not support yet. They
should be enabled back when we will add support for them by porting the
underlying native libraries.

Signed-off-by: Vlad-Andrei Badoiu <vlad_andrei.badoiu@stud.acs.upb.ro>
Signed-off-by: Costin Lupu <costin.lupu@cs.pub.ro>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>