mips elf n32 and 64 linker emulparams refactoring

[Alexandre Oliva]

This patch simplifies some of the mips emulation parameters such that
there is more sharing.  I've almost created a separate file for the
IRIX-compatible emulations, but I ended up thinking it was not worth
the trouble for a single definition of WRITABLE_RODATA, and stopped at
this point.  Ok to install?

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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