New port m32r-linux

[Doug Evans]

Kazuhiro Inaoka writes:
 > Do we need to keep the compatiblity of m32r-linux relocations with m32r-elf?
 > I want to change relocation type form REL to RELA for porting linux form
 > now.

Sorry to be rather chatty tonight.

mips already supports some form of REL + RELA support (or at least claims to).
See elfn32-mips.c and elf64-mips.c.
Using that as boilerplate seems like a good first step.
Certainly I wouldn't just cut-n-paste the entire thing over,
just use it as a guide.