Add missing function prototype for e_winlist_direction_select

This function is being used inside e_mod_main, but the function
prototype was never exposed which lead to implicit declaration
warnings when building winlist module

Signed-off-by: Chris Michael <cpmichael@osg.samsung.com>

src/modules/winlist/e_winlist.h

@@ -27,5 +27,6 @@ void e_winlist_right(E_Zone *zone);
 void e_winlist_down(E_Zone *zone);
 void e_winlist_up(E_Zone *zone);
 void e_winlist_modifiers_set(int mod, E_Winlist_Activate_Type type);
+void e_winlist_direction_select(E_Zone *zone, int dir);
 
 #endif