BUG: Include sunmath.h in npy_math.h when __SUNPRO_CC defined.
BUG: Include sunmath.h in npy_math.h when __SUNPRO_CC defined.

The include is needed for isinf.

Closes #3871.

NextThought/pypy-numpy,NextThought/pypy-numpy,NextThought/pypy-numpy,NextThought/pypy-numpy