Make java xlint warnings visible

Change-Id: If347c920df5e5aa0924a9f8d626d7e3e017d3536
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
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>