Removal of support for GCC hosted on UWIN

[Joe Buck]

> Why? On a U/WIN host the Uwin library is a system library (because U/WIN is the
> system), and the GPL allows linking with proprietary system libraries.

A user of U/WIN would be puzzled at the concept "a U/WIN host".
Furthermore when a GPLed application is built for U/WIN, the result
is not "a U/WIN application"; it is a Windows application, and can
be used in the normal Windows environment and not just the U/WIN
environment (ksh).

U/WIN is marketed as a package that runs on Windows systems that brings
extra functionality to WIN32 applications.  I challenge anyone to find
anything on

http://www.research.att.com/sw/tools/uwin/

that implies in any way that U/WIN is an OS.