configure: depend on glib >= 2.26 for clarity
configure: depend on glib >= 2.26 for clarity

Signed-off-by: Jonny Lamb <3d1fb3642aaab2ff70e3392a5ab916bf99eed6a3@collabora.co.uk>

freedesktop-unofficial-mirror/telepathy__telepathy-yell,freedesktop-unofficial-mirror/telepathy__telepathy-yell