MAINT: Add const qualifiers to char* types in pycapsule.pxd.
MAINT: Add const qualifiers to char* types in pycapsule.pxd.

Eliminate C compiler warnings by making the constness of the
char* pointers in the declarations in pycapsule.pxd match
the actual types of the PyCapsule_* functions.

scoder/cython,scoder/cython,cython/cython,da-woods/cython,scoder/cython,cython/cython,da-woods/cython,da-woods/cython,cython/cython,da-woods/cython,cython/cython,scoder/cython