Modernize NetBSD/powerpc support in GDB

[Nathan J. Williams]

This seems good, though less dramatic than you report. On my macppc
system, it took the testsuite from 788 to 753 failures (though with a
notable number of PASS->FAIL changes as well); on a AMCC 440 system,
it went from 179 to 170 failures, with only one PASS->FAIL regression
(which is a mysterious additional ^M in the output of "info
all-registers". Summary diffs attached, and I'm trying to figure out
why macppc is so much worse than the 440.

(the 440 has a bunch of additional failures vs. macppc that seem
related to its soft-float environment, but that's a subject for
another day)
 
        - Nathan

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