symbian ex: ignore irrelevant unknown signal warnings
symbian ex: ignore irrelevant unknown signal warnings

sevanteri/communi-desktop,jpnurmi/communi-desktop,communi/communi-symbian,communi/communi-symbian,gdamjan/communi-desktop,communi/communi-desktop,communi/communi-symbian,communi/communi-symbian,communi/communi-desktop