[PATCH] c99 math func log2

[Natanael Copa]

Hi,

Here is a patch for the c99 math func log2(). If this gets applied I
will look into the other c99 math funcs as well.

exp2
fdim
fma
fmax
fmin
nearbyint
nexttoward
remquo
scalbln
tgamma
trunc

I dont know how to use the test suite. Looks like test-double is just
disabled and I never managed to get the test suite to pass. I would be
thankful if someone could give me a hint.

-nc
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