Enable some FPU optimizations via standard pragma by default
If GCC -ffast-math is not supported, some floating point optimizations are still possible through more standard means: "FP_CONTRACT on" is a subset of -funsafe-math-optimizations. "FENV_ACCESS off" corresponds to -frounding-math. "CX_LIMITED_RANGE on" corresponds to -fcx-limited-range, but is not included as VLC does not use complex numbers anywhere yet.
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