ocarina: Remove idle_add() from the ocarina namespace

It's only used in ocarina.cpp, and it's already static there.

Signed-off-by: Bryan Schumaker <bjschuma@gmail.com>

include/ocarina/ocarina.h

@@ -19,7 +19,6 @@ void update_status();
 namespace ocarina
 {
 
-	void idle_add();
 	void init_pipe();
 
 };