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Update "BSD" license in math category
Update lang/pypy-devel to 2.4.0.

Release update for further testing by community.

Change Log:
 - Reduced internal copying of bytearray operations
 - Tweak the internal structure of StringBuilder to speed up large string
   handling, which becomes advantageous on large programs at the cost of
   slightly slower small benchmark type programs.
 - Move to a mixed polling and mutex GIL model that make mutlithreaded jitted
   code run much faster
 - Remove ctypes pythonapi and ctypes.PyDLL, which never worked on PyPy
 - Fix performance regression on ufunc(<scalar>, <scalar>) in numpy
 - Classes in the ast module are now distinct from structures used by the
   compiler, which simplifies and speeds up translation of our source code to
   the PyPy binary interpreter
 - Upgrade stdlib from 2.7.5 to 2.7.8
Upgrade to 1.7.8.