Rework automatic code generation

scripts/dbus-codegen

@@ -31,11 +31,9 @@ for file in $(ls -a $specs/*.xml); do
 		-a AsRefClosure \
 		-o "$out"
 
-	sed -i '1s/^/#![allow(clippy::all)]\n\n/' "$out"
-
 	rustfmt "$out"
 
-	echo "\nmod $name;\npub use self::$name::*;" >> "$modfile"
+	echo "\n#[allow(clippy::all)]\nmod $name;\npub use self::$name::*;" >> "$modfile"
 done
 
 git -C telepathy-spec checkout -- .