libdnet: Update to version 1.14

libdnet: Update to version 1.14

- Update from 1.11 (2005) to 1.14 (2020)
- Update of rootfile
- find-dependencies run and no problems flagged
- Package was originally provided by Dug Song in source forge and with a github repository
  No response was received from Dug Song to requests for updates and fixes so Oliver Falk
  forked the repository and has been working on it and now the Dug Song repository is no
  longer present and the old repoistory url redirects to the new ofalk repository
  https://github.com/ofalk/libdnet
- Issues raised in this new repository are being actively responded to
- Changelog comment is
   Finally release 1.14 with latest fixes included.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>