accelerate: Fix C type errors for GCC 14/Clang compatibility

[fweimer-rh]

This fixes type errors that cause build failures with current compilers:

src/numpy_formathandler.c: In function ‘__pyx_f_17OpenGL_accelerate_19numpy_form
athandler_12NumpyHandler_c_asArray’:
src/numpy_formathandler.c:6412:43: error: passing argument 1 of ‘(int (*)(PyArrayObject *, PyObject *))*(PyArray_API + 832)’ from incompatible pointer type
 6412 |     __pyx_v_res = PyArray_FillWithScalar(((PyObject *)__pyx_v_working), __pyx_v_instance);
      |                                          ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                           |
      |                                           PyObject * {aka struct _object *}
src/numpy_formathandler.c:6412:43: note: expected ‘PyArrayObject *’ {aka ‘struct tagPyArrayObject_fields *’} but argument is of type ‘PyObject *’ {aka ‘struct _object *’}
src/numpy_formathandler.c: In function ‘__pyx_pymod_exec_numpy_formathandler’:
src/numpy_formathandler.c:9799:3: error: returning ‘void *’ from a function with return type ‘int’ makes integer from pointer without a cast
 9799 |   import_array();
      |   ^~~~~~~~~~~~

Related to:

• https://fedoraproject.org/wiki/Changes/PortingToModernC
• https://fedoraproject.org/wiki/Toolchain/PortingToModernC