security/zeronet: Update to 0.5.5

[joneum]

Summary

• Update to 0.5.5

PR: 219475
Submitted by: Yuri Victorovich (maintainer)
Approved by: xxx (mentor)
#Differential Revision: https://reviews.freebsd.org/Dxxxxx

Test Plan

security/zeronet % portlint -AC
WARN: Makefile: possible use of absolute pathname "/var/db/zeronet".
WARN: Makefile: possible use of absolute pathname "/var/log/zeronet".
WARN: Makefile: for new port, make $FreeBSD$ tag in comment section empty, to make SVN happy.
0 fatal errors and 3 warnings found.

poudriere testport:

10amd64
10i386
11amd64
11i386
12.0-CURRENT r318899 amd64
12.0-CURRENT r318400 i386