[MERGE][bug #277484] win32/python2.4 extension fixes

[Alexander Belchenko]

John Arbash Meinel пишет:
> I was able to test that with this patch I can build using mingw32 and
> python2.4, I wasn't able to test using msvc because I don't have it
> here. The fix is pretty straightforward, but it would be nice if someone
> else could test it.

Everything built fine now with MSVC and python 2.4/2.5.
I did not ran test suite though.