- added big comment describing possible problems
- look for and react to versions of gcc, ld, and dlltool; mainly
this is done by the 'get_versions()' function and the CygwinCCompiler
and Mingw32CCompiler constructors
- move 'check_config_h()' to end of file and defer calling it until
we need to (ie. in the CygwinCCompiler constructor)
- lots of changes in 'link_shared_object()' -- mostly seems to be
library and DLL stuff, but I don't follow it entirely
major ports of GCC to Windows. Contributed by Rene Liebscher, and quite
untested by me. Apparently requires tweaking Python's installed config.h
and adding a libpython.a to build extensions.
Greg Ward