COMP: Ignore Cppcheck error about unused function in _tubetk_numpy.cxx.

The init_tubetk_numpy function is used as entry point when Python loads the
module.

Change-Id: I46d025a02cc27d10a10a920a1b5185fdd034cbd9
Merge topic 'CppcheckErrors'

8e66670 COMP: Ignore Cppcheck error about unused function in _tubetk_numpy.cxx.