Unconditionally enable the LXC support/bits on any Linux architecture

Pino Toscanorequested to merge
pino/libvirt:lxc-on-all-linux into debian/latest

Previously it used to be enabled on any Linux architecture excluding ia64; since that architecture was decommissioned, then it is easier to drop the list of architectures and simply use linux-any for the LXC driver and the login shell.

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