[commit/obish] Eliminate mips_pc_in_sigtramp, delete fallout

[Andrew Cagney]

Again, switching MIPS to unwinders has made this code dead (OSABI code 
instead implements a sigtramp unwinder).  The fallout is fixup_sigtramp, 
since it is mips specific and no longer called, I've deleted that as well.

committed,
Andrew
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