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

[STINNER Victor]

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

Updated patch to use the system log2() if it is available. The test pass with the system log2() on Linux (Debian Sid, eglibc 2.11.2).

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Added file: http://bugs.python.org/file21897/issue11888-2.patch

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