[glib] Non-fast-forward update to branch nacho/gtask-performance

[Ignacio Casal Quinteiro <icq src gnome org>]

The branch 'nacho/gtask-performance' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  5dc1d7e... gtask: use strdup_printf in g_task_return only if needed

Commits added to the branch:

  9b63f4c... gtask: use strdup_printf in g_task_return only if needed