security/libmcrypt: Pass maintainership to submitter

While I'm here:

• Fix the license and add the path to that license
• Sort variables a bit according to the PHB and to pet portlint

PR: 235433
Submitted by: John von Essen <john@essenz.com>
Reviewed by: tcberner (mentor)
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D19102