Allow 32-on-64 execution for LXC guests
Using the 'personality(2)' system call, we can make a container on an x86_64 host appear to be i686. Likewise for most other Linux 64bit arches. * src/lxc/lxc_conf.c: Fill in 32bit capabilities for x86_64 hosts * src/lxc/lxc_container.h, src/lxc/lxc_container.c: Add API to check if an arch has a 32bit alternative * src/lxc/lxc_controller.c: Set the process personality when starting guest
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