[issue11888] Add C99's log2() function to the math library

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> We can provide log2() only if the C library has this function.

Big -1 from me:  I'd hate to see working Python scripts written on Unix fail on Windows because of a missing log2.

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<http://bugs.python.org/issue11888>
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