tools/telepathy.am: update from telepathy-glib master
tools/telepathy.am: update from telepathy-glib master

This adds support for out-of-tree releases, and parallel-built releases.

freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut