math: new software sqrtf

same method as in sqrt, this was tested on all inputs against
an sqrtf instruction. (the only difference found was that x86
sqrtf does not signal the x86 specific input-denormal exception
on negative subnormal inputs while the software sqrtf does,
this is fine as it was designed for ieee754 exceptions only.)

there is known faster method:
"Computing Floating-Point Square Roots via Bivariate Polynomial Evaluation"
that computes sqrtf directly via pipelined polynomial evaluation
which allows more parallelism, but the design does not generalize
easily to higher precisions.

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