Support for the Renesas M32C and M16C

[Jim Blandy]

I've committed the M32C binutils port changes.

Alan Modra <amodra@bigpond.net.au> writes:
> Please use generic BFD relocs where possible.
> 
> eg. BFD_RELOC_8, BFD_RELOC_8_PCREL

In looking into this, I realized that all the M32C relocs we had
defined could actually become generic relocs, and the reloc vocabulary
could be greatly reduced, so I made that change.

Thanks for the review.