[glib] (6 commits) ...Merge branch 'wip/oholy/gappinfo-async' into 'master'

[Philip Withnall <pwithnall src gnome org>]

Summary of changes:

  0a1730d... gfile: Fix leak in g_file_query_default_handler() (*)
  f72a5d6... gfile: Add g_file_query_default_handler_async() (*)
  cec5778... gappinfo: Add launch_uris_async() and launch_uris_finish()  (*)
  904bb26... gappinfo: Use g_app_info_launch_uris_async() for async call (*)
  051c6ba... gio-tool-open: Use g_app_info_launch_default_for_uri_async( (*)
  08e5c89... Merge branch 'wip/oholy/gappinfo-async' into 'master'

(*) This commit already existed in another branch; no separate mail sent