net-p2p/namecoin: Update to 0.17.0

Also, switched to Qt5 because net/qt4-network is required by dependency
however it fails to build with OpenSSL 1.1.1. FreeBSD base OpenSSL has been
switched to 1.1.1 since FreeBSD 12.

PR: 233201
Submitted by: Chad Jacob Milios <milios@ccsys.com> (maintainer)
Approved by: mentors (implicit)