mips64 sigaction changes

[Alexandre Oliva]

This patch ports sigaction to all 3 mips64 ABIs.  __restore and
__NR_restore are probably not really necessary, since n32 and n64
always use the rt variants and o32 doesn't need a sa_restorer, but I
thought it wouldn't hurt to put it in, just in case...  Ok?

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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