Add gcov libs to gtkdoc scanner libs to make it work both gtk-doc and coverage enabled
Add gcov libs to gtkdoc scanner libs to make it work both gtk-doc and coverage enabled

tieto/farstream,pexip/farstream,kakaroto/farstream,shadeslayer/farstream,ahmedammar/skype_farsight2,shadeslayer/farstream,tieto/farstream,kakaroto/farstream,tieto/farstream,tieto/farstream,ahmedammar/skype_farsight2,shadeslayer/farstream,shadeslayer/farstream,pexip/farstream,ahmedammar/skype_farsight2,pexip/farstream,ahmedammar/skype_farsight2,tieto/farstream,kakaroto/farstream,pexip/farstream,kakaroto/farstream