Android: Auto installation of missing necessary SDK packages

Task-number: QTCREATORBUG-18978
Change-Id: Iac3e2c956ac3da717c6509f28b8d810827947ea0
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

src/plugins/android/androidsettingswidget.h

@@ -77,6 +77,7 @@ public:
 private:
     void validateJdk();
     void validateNdk();
+    void onSdkPathChanged();
     void validateSdk();
     void openSDKDownloadUrl();
     void openNDKDownloadUrl();