[RFA/mingw32] environment variables are case-insensitive on win32

[Jerome Guitton]

Pedro Alves (palves@redhat.com):

> And then, if that's true, a run time test in GDB like in the present
> patch, doesn't actually detect this, because GDB itself is a Cygwin
> program and will behave like those export + env calls?
> 
> Oh, I think that's what Jerome is saying in
> 
>  http://sourceware.org/ml/gdb-patches/2012-12/msg00134.html
> 
> ?

I confirm.


> So all in all, I think we should just ignore Cygwin for now (leave it
> case-sensitive like today), forget the run-time test in GDB, and go
> back to focusing on Windows/mingw alone.

Agreed.