experimental mingw port of GCC4

[Thomas Weidenmueller]

I spent some time doing a mingw port of GCC4 lately and here's my
experimental mingw-special-reactos port for win32:

http://www.reactsoft.com/mingw-special-reactos-20050510.zip

The reactos tree fully compiles from rev. 15198 on and appears to work
fine. However, please read notes.txt inside the archive to get it to
work properly (default paths are messed up, so you have to set up three
environment variables).

Compiling reactos with it will produce quite a bunch of warnings, mostly
from 3rd party libraries (e.g. oskittcp, mesa32), the imported wine code
and explorer.

Best Regards,

Thomas