cad/librnd: Update 4.3.2 => 4.4.0, take maintainership

Maintainer wasn't active for the last 2 years.

News:

• http://www.repo.hu/projects/librnd/news.html

Release notes:

• http://www.repo.hu/projects/librnd/releases/relnotes-4.4.0.txt

Changelogs:

• http://www.repo.hu/projects/librnd/releases/changelog-4.4.0.txt

Approved by: yuri@ (Mentor)
Differential Revision: https://reviews.freebsd.org/D53377