MAINT: Define NPY_NO_DEPRECATED_API in struct_ufunc_test.c.src
MAINT: Define NPY_NO_DEPRECATED_API in struct_ufunc_test.c.src

Removes a compile warning and makes the function use proper macro
replacements. Also fix a pointer type mismatch warning.

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