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

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset d3f9895e2e19 by Mark Dickinson in branch 'default':
Issue #11888: remove duplicate check for log2 in configure.in.
http://hg.python.org/cpython/rev/d3f9895e2e19

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