enable n32 and n64, and move o32 into mips/mips32

[Alexandre Oliva]

This is the last patch of the batch, hopefully keeping the o32 port
functional, while enabling people to try to build n32 and n64.  I
still intend to make some changes to the top-level configuration.  In
particular, I remember Roland didn't quite like the introduction of
flags_for_cc, so I'm probably going to take that out of the top level
and move it into linux/mips/configure.in or so.  As for the
configuration triplets, they're changing as well.  Ben Elliston didn't
quite like the idea of adding mips64{n32,n64,o32}-linux-gnu to
config.{guess,sub}, and suggested using the already-supported and
somewhat more standard specification of the abi after linux-gnu.

Another change I'd love to make is to drop all of the little-endian
bits/endian.h, and use a single endian.h that decides endianness based
on compiler pre-defined macros, just like the ARM and the SH.  Any
objections?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                 aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer