Use a macro to determine the size of arrays

Use following macro instead of "sizeof(x) / sizeof(x[0])" everywhere:

    #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/wins.c

@@ -678,18 +678,15 @@ void wins_status_bar(void)
 	switch (active_panel) {
 	case CAL:
 		bindings = bindings_cal;
-		bindings_size =
-		    sizeof(bindings_cal) / sizeof(bindings_cal[0]);
+		bindings_size = ARRAY_SIZE(bindings_cal);
 		break;
 	case APP:
 		bindings = bindings_apoint;
-		bindings_size =
-		    sizeof(bindings_apoint) / sizeof(bindings_apoint[0]);
+		bindings_size = ARRAY_SIZE(bindings_apoint);
 		break;
 	case TOD:
 		bindings = bindings_todo;
-		bindings_size =
-		    sizeof(bindings_todo) / sizeof(bindings_todo[0]);
+		bindings_size = ARRAY_SIZE(bindings_todo);
 		break;
 	default:
 		EXIT(_("unknown panel"));