Warn when directory ownership differs between filesystem and package

We currently only warn if a directory's permissions differ, but using -Qkk
on my system shows that directory permissions tend to change in packages
reasonably frequently without notice.  Provide a warning in such cases
so that it can be altered.  Example output:

(1/1) reinstalling nginx
warning: directory ownership differs on /var/lib/nginx/proxy/
filesystem: 33:0  package: 0:0

Signed-off-by: Allan McRae <allan@archlinux.org>

0 files changed, 0 insertions, 0 deletions