[python-win32] Building Python in Singlethread mode !

[Seb]

Greetings !

We are currently experiencing problems with the way our C++ application is
interacting with the Python modules we made. (Interfacing is done through
SIP)

We discovered that each calls from our C++ app to any functions implemented
in a Python modules needs to be encapsulated by Py_BEGIN_ALLOW_THREADS and
Py_END_ALLOW_THREADS.

This solves the crashing problems we had so far but causes new crashing
problems in other parts of the code.
We thought that we should try a Python version build in single thread mode.

Any suggestions ?

Thanks !