clang+libc++ using missing powl

[Baptiste Daroussin]

Hi,

I'm running exp-run to build the whole ports tree with clang using libc++ by
default.

As a result we have a lot of fallouts of ports complaining about:
undefined reference to `powl'

It seems like libc++ is relying on a function we don't have yet in libm, am I
missing something?

regards,
Bapt
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