WIN-13: create win32.cc, configury update

[Bryce McKinlay]

Adam Megacz wrote:

>Ok to commit?
>
>  - a
>
>2002-02-04  Adam Megacz <adam@xwt.org>
>
>        * win32.cc: Created it.
>          configure.in: Added PLATSRC, which is set to posix.cc or win32.cc.
>          Makefile.am: Updated it to use $(PLATSRC).
>

OK, but how about calling the variable PLATFORM_SPECIFIC_SOURCES or 
something in order to make it a bit clearer?

Bryce.