[Distutils] change to compiler implementations

[Thomas Heller]

From: "Jeremy Hylton" <jeremy@zope.com>
> I just checked in two sets of changes to distutils.  I refactored in
> the implementation of compile() methods and I added some simple
> dependency tracking.  I've only been able to test the changes on Unix,
> and expect Guido will soon test it with MSVC.  I'd appreciate it if
> people with other affected compilers (Borland, Cygwin, EMX) could test
> it.
> 
I've tested some of my extensions with MSVC, and it works fine.

Thomas