c/files.pm: Only open .pc files if they are indeed files

Signed-off-by: Niels Thykier <niels@thykier.net>
c/shared-libs: Correct the path to the multiarch-dirs data file

The data file was renamed in 2.5.17 (commit 37774bb) and since then
the check has errored out if the data was needed.

Signed-off-by: Niels Thykier <niels@thykier.net>
Test::Lintian: Load data files eagerly during tests

Signed-off-by: Niels Thykier <niels@thykier.net>
d/changelog: s/typoes/typos/

Signed-off-by: Niels Thykier <niels@thykier.net>
Release Lintian/2.5.18.1 into unstable

Signed-off-by: Niels Thykier <niels@thykier.net>