Without qtpositioning from qtlocation source module, we have no support
for geolocation.

Also correct a false dependency on xmlpatterns, and adds a feature
report on geolocation at configure time.

Change-Id: I7d80b8288631401bf4c8aaa2541327a52910c3e6
Reviewed-by: Michael Brüning <michael.bruning@theqtcompany.com>