[Libguestfs] [PATCH v2 0/2] customize: Allow --selinux-relabel flag to work on cross-architecture builds.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1212807 Since v1: - Combine the virt-builder detection code into virt-customize. - Enables us to delete Architecture and Uname modules completely. Rich.