security/libmcrypt: Pass maintainership to submitter

[kai]

Summary

PR 235433

• Submitter becomes maintainer

While I'm here:

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

Test Plan

• security/libmcrypt is still in its latest version at 2.5.8
• portlint -> OK
• test build with 11.2-RELEASE (amd64) to rule out any typos with the newly introduced LICENSE_FILE -> OK

[tcberner]

Looks good to me.