query: add annotations to gst_query_set_nth_allocation_pool()
query: add annotations to gst_query_set_nth_allocation_pool()

https://bugzilla.gnome.org//show_bug.cgi?id=736424

centricular/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,jpxiong/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,centricular/gstreamer,krichter722/gstreamer,jpxiong/gstreamer,jpxiong/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,jpxiong/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer