Add "Optional for" to package information output

Much like packages that require a give package are displayed in the
"Required by" field of its information output, alos display packages
that optionally require the package.

Inspired-by: Benedikt Morbach <benedikt.morbach@googlemail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

0 files changed, 0 insertions, 0 deletions