> Sure - it actually builds a python.exe which is fully working for me.
> If you need a proof, please let me know, I have no problem uploading
> it somewhere...

This is useless, of course.  The build must be reproducible.
Here is what I did so far:

- Open a cmd.exe console, ensure that msys/bin and mingw/bin are in the PATH
- Run "sh configure" - it's slow, but works.
- Run "make"
- Re-running "make -k" fails on three files: import.c, posixmodule.c, and pwdmodule.c

Your patch does not touch import.c, and the pwd module should probably be removed from a Python running on Windows.
Do you use another method to compile Python?