integrating latest mingw headers/startup

[Mumit Khan]

On Mon, 5 Apr 1999, Geoffrey Noer wrote:

> 
> I just finished committing this into our sources.  The only changes I
> kept were to the Makefile.in so that the includes would be installed
> into a mingw32 directory for optional inclusion by gcc.  (Other than
> that, they were directly imported).
> 

Thanks Geoffrey. 

You may also want to take out the stub libm.a from installing since 
that'll overwrite the newlib one. Also, alloc.h is now gone.

Regards,
Mumit