Updated build.rs to avoid rerunning every time

emit_cargo_build_message was wrongly adding generated files to the rerun directive, replaced with custom println

build.rs

@@ -9,5 +9,5 @@ pub fn main() {
         .expect("Failed to generate Rust MAVLink bindings");
 
     mavlink_bindgen::format_generated_code(&result);
-    mavlink_bindgen::emit_cargo_build_messages(&result);
+    println!("cargo:rerun-if-changed=message_definitions")
 }