libs/gst/controller/gstcontroller.*: Added GList* version of _remove_properties() in order to be able to wrap it in b...

Original commit message from CVS:
* libs/gst/controller/gstcontroller.c: (gst_controller_remove_properties_list):
* libs/gst/controller/gstcontroller.h:
Added GList* version of _remove_properties() in order to be able to wrap
it in bindings.