Android: Fix lupdate-warning about missing Q_OBJECT.

Change-Id: I9a55e811842bb6b1a51737f668ed249f328c9c62
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/android/androidpackageinstallationstep.h

@@ -61,6 +61,7 @@ private:
 
 class AndroidPackageInstallationStepWidget : public ProjectExplorer::BuildStepConfigWidget
 {
+    Q_OBJECT
 public:
     AndroidPackageInstallationStepWidget(AndroidPackageInstallationStep *step);