configure: add AC_ARG_ENABLE(debug)
configure: add AC_ARG_ENABLE(debug)

https://bugs.freedesktop.org/show_bug.cgi?id=69216

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