Set XDG_DATA_DIRS to make sure we don't use /usr/share from the
appmonitor test. We will soon throw a warning if we find defaults.list,
so make sure we don't open ourselves up to that if there is one on the
system.
https://bugzilla.gnome.org/show_bug.cgi?id=728040
gchar *path;
path = g_mkdtemp (g_strdup ("app_monitor_XXXXXX"));
+ g_setenv ("XDG_DATA_DIRS", path, TRUE);
g_setenv ("XDG_DATA_HOME", path, TRUE);
g_test_init (&argc, &argv, NULL);