release-5 restorecd issue

I'm not sure if this is fixed yet, sorry if it is.

I got the first version of the restore cd and did a complete overwrite
to a new drive on my Qube2 tonight.

When I tried to use chsh to change the shell, it complained that the
sticky bit wasn't set on /tmp.

I think this is common when unpacking the sets without using the
"preserve" option. If using tar, it's the -p option.

You can fix the problem by doing this:

chmod 1777 /tmp

Is this worth a pr?

Andy