Patch: GC mach_dep file extensions

[Tom Tromey]

>>>>> "Bryce" == Bryce McKinlay <bryce@waitaki.otago.ac.nz> writes:

Bryce> Hans pointed out that ".S", not ".s" is the correct extension
Bryce> for some asm files because it means "put this through the
Bryce> preprocessor first".  I've checked in this patch.

I think it is a little better to arrange to run these with `-x
assembler-with-cpp'.  My reason is that on case-insensitive file
systems, `.S' and `.s' will appear the same.

Tom