Android: Remove missing Qt version warning

Task-number: QTCREATORBUG-21421
Change-Id: I1442c574e6d9bcd7e407e07a6ce688ddf45e86f3
Reviewed-by: BogDan Vatra <bogdan@kdab.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

src/plugins/android/androidsettingswidget.h

@@ -91,7 +91,6 @@ private:
     void manageAVD();
     void createKitToggled();
 
-    void checkMissingQtVersion();
     void updateUI();
     void updateAvds();