telepathy-glib.supp: ignore GSlice initialization
telepathy-glib.supp: ignore GSlice initialization

The previous suppression only worked for GLib in /usr, and wasn't very
specific.

Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib