This patch changes rules.d/debhelper.mk to copy various files from the
glibc build tree into the libc6-pic package.

This allows Plash to build its modified version of glibc from
libc6-pic.

Background: Plash is a secure, restricted execution environment that
provides functionality similar to chroot(), but more flexible and
lightweight.  It works partly by dynamically linking Linux executables
with a modified glibc.  This is not used for taking authority away
from a process, only for giving it back.  This approach is more
complete than using LD_PRELOADed libraries.  There's more information
on what Plash does at <http://plash.beasts.org>.

Once this patch is applied it should be possible to put Plash into
Debian.

I'm filing a second BTS entry for a patch to glibc itself for
preventing some system calls from being inlined, which Plash also
needs.

Mark