package/lxc: bump version to 1.1.5

[Thomas: download location changed to
https://linuxcontainers.org/downloads/lxc

, as noticed by Santosh
Multhalli.]

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>