make_chroot: seed crossdev overlay with a simple layout.conf

This is just enough to silence the warnings that newer portage generates.
They're harmless, but can be confusing (especially since they are shown
many times).  When we eventually run crossdev, it'll regen this file with
its own updated version.

TEST=`cbuildbot chromiumos-sdk` passes

Change-Id: Id7f4c348ec8182e6a4ce0fb1612b6efd11dc8f46
Reviewed-by: Bertrand Simonnet <>
Commit-Queue: Mike Frysinger <>
Tested-by: Mike Frysinger <>
1 file changed