Fix a bunch of warnings

Mostly adding __unused where needed.

Change-Id: Ia4f675b9b360782728c361ed1699db0cc277c3a5
diff --git a/gui/checkbox.cpp b/gui/checkbox.cpp
index 8eb0f52..1760bac 100644
--- a/gui/checkbox.cpp
+++ b/gui/checkbox.cpp
@@ -148,7 +148,7 @@
 	return 0;
 }
 
-int GUICheckbox::NotifyTouch(TOUCH_STATE state, int x, int y)
+int GUICheckbox::NotifyTouch(TOUCH_STATE state, int x __unused, int y __unused)
 {
 	if (!isConditionTrue())
 		return -1;