tests/test-archive-symlinks.out

Don't use sed -r; instead use old-style regexp

Rev d895158fe8af introduced some sed -r tests, but -r is only available on GNU
sed, while BSD sed uses -E. Better to use old-style regular expressions, that
way the tests work on all sed variants.

% files
dangling -> nothing
% tar
dangling -> nothing
% zip
dangling -> nothing