[opus] configure options for x86

[Sean Darcy]

On Fedora 22, building opus git. There are a number of configure options
that I'd like some help on

--enable-float-approx, enable fast approximations for floating point

does this have a material effect on encoding speed, or quality ?

--enable-intrinsics, Enable intrinsics optimizations for ARM(float)
X86(fixed)

so this only works on x86 if you're building fixed-point ? If you are, any
reason not to enable intrinsics ?

--enable_rtcd

Is this only for arm ?

Thanks,

sean
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