security/p5-Mcrypt: Fix link issue and miscellaneous cleanup

• Fix issue that Mcrypt.so is linked with libltdl.so if the port is build under the environment where devel/libltdl is installed
• Add TIMESTAMP to distinfo
• Switch to DISTVERSION
• Regenerate pkg-plist with make makeplist
• Pet portlint and portclippy

PR: 259210
MFH: 2021Q4