Fix xlint unchecked warning (java)

This patch fixes the warning uncoverd by the -Xlint:unchecked option
by parametrising the generics with wildcards.

src/org/qtproject/qt5/android/QtActivityDelegate.java:315:
warning: [unchecked] unchecked call to getMethod(String,Class<?>...) as a member of the raw type Class
                    Method m = initClass.getMethod("setActivity", Activity.class, Object.class);

Change-Id: I665e9dfd6d64c92a491d68c838ad02bde275d604
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

src/android/jar/src/org/qtproject/qt5/android/QtActivityDelegate.java

@@ -310,7 +310,7 @@ public class QtActivityDelegate
 
                 try {
                     @SuppressWarnings("rawtypes")
-                    Class initClass = classLoader.loadClass(className);
+                    Class<?> initClass = classLoader.loadClass(className);
                     Object staticInitDataObject = initClass.newInstance(); // create an instance
                     Method m = initClass.getMethod("setActivity", Activity.class, Object.class);
                     m.invoke(staticInitDataObject, m_activity, this);