x11-wm/xdgmenumaker: Update 2.3 => 2.4, take maintainership

Commit log:
https://github.com/gapan/xdgmenumaker/compare/2.3...2.4

Port changes:

• Switch to DISTVERSION instead.
• Specify LICENSE_FILE.
• Use ${PORTNAME} variable for SHEBANG_FILES instead.
• Polish Makefile with portclippy and portfmt.
• Add NO_ARCH - "no architecture specific files found".
• Submitter take maintainership.

PR: 291698