log2, log2f

[Yaakov (Cygwin/X)]

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SUSv3 requires that log2 and log2f be defined as functions (at least)
and may also be defined as macros.  Right now, though, these are only
defined as macros, and besides being noncompliant, it also creates false
negatives with configure AC_CHECK_FUNC[S] tests.

Here's my first attempt at a patch to define these as functions instead.


Yaakov
Cygwin/X
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