security/luasec: update to 0.9

• change DISTVERSIONPREFIX due to GitHub naming
• reorder variable assignment to make portlint more happy
• update MAKE_ENV to no longer depend on post-patch and do-install
• update broken WWW link

Changelog: https://github.com/brunoos/luasec/blob/v0.9/CHANGELOG

PR: 243919
Approved by: koobs (mentor), bapt (mentor)
Approved by: portmgr (maintainer timeout: > 2 weeks)
Differential Revision: https://reviews.freebsd.org/D23823