[v3] atomic macro guard cleanup

[Benjamin Kosnik]

Changes _GLIBCXX_ATOMIC_BUILTINS to _GLIBCXX_ATOMIC_BUILTINS_1 and
_GLIBCXX_ATOMIC_BUILTINS_4, tests more of the __sync builtins.

This should fix up the config error with mips and others, although the
current fallbacks w/o atomics are incorrect stub functions, instead of
mutex-locked functions a la the exchange_and_add variants that
ext/atomicity.h uses. That is a later patch...

tested x86_64/linux
tested x86/linux

-benjamin
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