Created attachment 182322 [details] [review]
GDbus: avoid C compile errors when using reserved names as parameters

When using a reserved parameter in a DBus method/signal (like "self")
there are compilation issues.

Example:
[DBus (name = "org.example.Demo")]
public class DemoServer : Object {
	public int ping (string self) {
		print(self+"\n");
	}
}

The same would happen using an interface (DBus client); the attached patch fixes it using the get_variable_cname function to get the valid variable name.