Filenames differing in case (was GCC on a Mac HFS filesystem)

[Joe Buck]

> We already have 
> *	libffi/src/mips/n32.S
> *	libffi/src/mips/n32.s
> *	libffi/src/mips/o32.S
> *	libffi/src/mips/o32.s
> 
> This causes some warnings when using CVS on cygwin, but fortunately the
> files aren't used.

What if someone wants to build a cross-compiler with a mips target?