A while ago, I posted MIPS and ARM NPTL support for gdbserver.
Before I got around to checking it in, Mark K. looked at one of
them and went "ewwww..."; it was just copied from three other places
in gdbserver, but I totally agree with his reaction. So this patch
un-ewwws things a bit. Instead of borrowing gdb_proc_service.h
from gdb, this patch gives gdbserver its own, slightly different
copy.
We don't use the prfpregset_t functions at all, so we can lose some
old autoconf checks, too.
Tested and committed.