replace macro PYC_INTERPRETER_ACTIVE for PyC_IsInterpreterActive() function call,

(indirectly referenced Python define of ~30 lines, most were optimized out but still caused some code bloat).

source/blender/python/generic/py_capi_utils.h

@@ -56,7 +56,7 @@ void PyC_MainModule_Restore(PyObject *main_mod);
 
 void PyC_SetHomePath(const char *py_path_bundle);
 
-#define PYC_INTERPRETER_ACTIVE (((PyThreadState *)_Py_atomic_load_relaxed(&_PyThreadState_Current)) != NULL)
+bool PyC_IsInterpreterActive(void);
 
 void *PyC_RNA_AsPointer(PyObject *value, const char *type_name);