[Development] Implicit VFMADD support (Was: Updating x86 SIMD support in Qt)

[Konstantin Shegunov]

Related, but somewhat offtopic for the original thread.
Do we get `-mfma` (or equivalent) added, whenever supported, while we build
Qt. Is it part of the feature detection? Because I want `std::fma` to emit
the instruction(s), but I've noticed that in the code I test a bugfix with
I must force the issue by passing the flag explicitly; even with -O2 I get
a function call otherwise.
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