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

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 34871c3072c9 by Victor Stinner in branch 'default':
Issue #11888: skip some log2 tests on Mac OS X Tiger
http://hg.python.org/cpython/rev/34871c3072c9

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