Stop calling g_type_init()

It was deprecated in GLib 2.36, and we already have a hard dependency
on that version.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=71048
Reviewed-by: Guillaume Desmottes <guillaume.desmottes@collabora.co.uk>
Enable GLib 2.36 deprecation warnings

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=71048
Reviewed-by: Guillaume Desmottes <guillaume.desmottes@collabora.co.uk>
TpConnectionManager: add more debug for tp_list_connection_managers()

Based on a patch by Guillaume Desmottes.

Reviewed-by: Guillaume Desmottes <guillaume.desmottes@collabora.co.uk>
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=68390
examples: explicitly ask for TelepathyGLib-0.12

TelepathyGLib-1 isn't going to be fully compatible.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=49737
Reviewed-by: Guillaume Desmottes <guillaume.desmottes@collabora.co.uk>