Integrate .pre-commit-config.yaml

(cherry picked from commit e0d363aad8)

include/godot_cpp/variant/array_helpers.hpp

@@ -28,6 +28,9 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
 /**************************************************************************/
 
+#ifndef GODOT_ARRAY_HELPERS_HPP
+#define GODOT_ARRAY_HELPERS_HPP
+
 namespace godot {
 namespace helpers {
 template <typename T, typename ValueT>
@@ -48,3 +51,5 @@ T append_all(T appendable) {
 }
 } // namespace helpers
 } // namespace godot
+
+#endif // GODOT_ARRAY_HELPERS_HPP