www/pecl-yaf: Update from 3.0.5 to 3.0.6

Changelog: https://pecl.php.net/package-changelog.php?package=yaf&release=3.0.6

*While here:

• Switch to DISTVERSION
• Pet portlint
• Add LICENSE_FILE

PR: 225245
Submitted by: johnpupu@gmail.com (maintainer)
Approved by: mentors (implicit)