[issue399] add fenv to libm

[Peter Avalos (via DragonFly issue tracker)]

Peter Avalos <pavalos at theshell.com> added the comment:

I have this in my post-release branch.

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assignedto:  -> pavalos
nosy: +pavalos
status: chatting -> in-progress

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DragonFly issue tracker <bugs at lists.dragonflybsd.org>
<http://bugs.dragonflybsd.org/issue399>
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