Don't define FP_FAST_FMA on sparc64; with the recent fixes, fma() is no longer "fast" on sparc64.  (It really wasn't to begin with, since the old implementation was using long doubles, and long doubles are emulated in software on sparc64.)
Don't define FP_FAST_FMA on sparc64; with the recent fixes, fma() is
no longer "fast" on sparc64.  (It really wasn't to begin with, since
the old implementation was using long doubles, and long doubles are
emulated in software on sparc64.)

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