Allowed the improper_ctypes_definitions lint on our generated rcl bindings. (#341)

Co-authored-by: Sam Privett <[email protected]>

Author: maspe36

rclrs/src/rcl_bindings.rs

@@ -7,6 +7,7 @@
 // Caused by https://github.com/ros2/ros2/issues/1374 in iron and newer
 // See https://github.com/ros2-rust/ros2_rust/issues/320
 #![allow(improper_ctypes)]
+#![allow(improper_ctypes_definitions)]
 #![allow(clippy::all)]
 #![allow(missing_docs)]