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

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> we have to wait 12 hours or maybe one day to wait for all buildbots

Oh, it's faster than expected: test_math passed on FreeBSD 6.4 3.x buildbot. I was waiting for this one because it's an old OS and many tests fail on this buildbot (because it's old but also slow). So test_math passed on all buildbots. Let's try the system log2 :-)

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