security/i2pd: Update to 2.40.0

• Take maintainership
• Switch to DISTVERSION
• Enable AESNI by default (run time detection if it can be used or not)
• Pet portfmt and portclippy
• Respect hier(7) for config files and dirs

Changes: https://github.com/PurpleI2P/i2pd/releases/tag/2.40.0
PR: 260206
Approved by: 0mp (mentor)
Differential Revision: https://reviews.freebsd.org/D33384