CamelKolabIMAPXStore: GLib 2.32 GMutex fixups
CamelKolabIMAPXStore: GLib 2.32 GMutex fixups

* g_mutex_new() / g_mutex_free() have been deprecated
  in GLib 2.32 in favor of g_mutex_init() / g_mutex_clear()

GNOME/evolution-kolab,GNOME/evolution-kolab