Fix T102845: GPU python crash in background mode

`BPYGPU_IS_INIT_OR_ERROR_OBJ` is not implemented in all pygpu functions.

Instead of copying and pasting that call across the API when it has no
gpu context, override the methods with one that always reports error.

source/blender/python/gpu/gpu_py.h

@@ -9,15 +9,5 @@
 extern struct PyC_StringEnumItems bpygpu_primtype_items[];
 extern struct PyC_StringEnumItems bpygpu_dataformat_items[];
 
-bool bpygpu_is_init_or_error(void);
-
-#define BPYGPU_IS_INIT_OR_ERROR_OBJ \
-  if (UNLIKELY(!bpygpu_is_init_or_error())) { \
-    return NULL; \
-  } \
-  ((void)0)
-#define BPYGPU_IS_INIT_OR_ERROR_INT \
-  if (UNLIKELY(!bpygpu_is_init_or_error())) { \
-    return -1; \
-  } \
-  ((void)0)
+PyObject *bpygpu_create_module(PyModuleDef *module_type);
+int bpygpu_finalize_type(PyTypeObject *py_type);