devel/xc3sprog: Adopt/Update to latest commit

• Move to forked project [1]
• Makefile cleanup
• Install missing binaries
• Install manual page
• Use pkg-plist (>5 items)
• Add LICENSE
• Submitter becomes maintainer
• Bump PORTEPOCH

[1] Original project have no activity for years

WWW: https://github.com/DanielO/xc3sprog

PR: 266837