build: Drop linux-user-chroot around yocto build
build: Drop linux-user-chroot around yocto build

Unfortunately at least on RHEL6, using --clone-pid breaks
/proc/pid/tasks/taskid, which in turn breaks "cp -afl" inside
the chroot because coreutils "cp" is trying to set the filesystem
creation context.

GNOME/gnome-ostree,vrutkovs/vrutkovs.github.io,vrutkovs/vrutkovs.github.io,chergert/gnome-continuous,GNOME/gnome-ostree,vrutkovs/vrutkovs.github.io,chergert/gnome-continuous,GNOME/gnome-ostree,chergert/gnome-continuous