.gitignore: ignore link if target is included from feed
If an out of tree target is included via a feed, then there is a link with
the name 'feed' in the target directory. Do not show this link in git.
Signed-off-by: Florian Eckert <[email protected]>
(cherry picked from commit 13e7a2d19f4545170a8deaab03411bc37182f7c4)