Removal of support for GCC hosted on UWIN

[dewar@gnat.com]

<<Sorry.  I did not mean to imply that Interix only provides POSIX
libraries, however isn't that what we are talking about here?  U/WIN
certainly offers more than just a 'libc.a'.

For a user of U/WIN, U/WIN looks pretty much like any other Unix system.
>>

But Interix *IS* unix, it is simply a port of standard Unix code with the
low level interfaces of the kernel replaced by calls to the NT kernel.

I really am amazed at any attempt to equate U/WIN and Interix, I would
be surprised if anyone who had used and worked with interix would regard
it as anything other than a normal port of Unix. We are not just talking
library interfaces here, but the whole deal, tools, shells, etc, and
these are not just simulations of the Unix tools and shells, they ARE
the standard code, ported just as one would do the port for any other
Unix port.