Cleanup: ignore GCC cast-function-type warning for PyMethodDef's

PyMethodDef::ml_flags define the function signature making the warning
meaningless.

source/blender/python/gpu/gpu_py_platform.cc

@@ -117,6 +117,11 @@ static PyObject *pygpu_platform_backend_type_get(PyObject * /*self*/)
 /** \name Module
  * \{ */
 
+#if (defined(__GNUC__) && !defined(__clang__))
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wcast-function-type"
+#endif
+
 static PyMethodDef pygpu_platform__tp_methods[] = {
     {"vendor_get",
      (PyCFunction)pygpu_platform_vendor_get,
@@ -141,6 +146,10 @@ static PyMethodDef pygpu_platform__tp_methods[] = {
     {nullptr, nullptr, 0, nullptr},
 };
 
+#if (defined(__GNUC__) && !defined(__clang__))
+#  pragma GCC diagnostic pop
+#endif
+
 PyDoc_STRVAR(pygpu_platform__tp_doc, "This module provides access to GPU Platform definitions.");
 static PyModuleDef pygpu_platform_module_def = {
     /*m_base*/ PyModuleDef_HEAD_INIT,