net/remotebox: Update to 2.4

freebsd_ports@k-worx.org takes maintainership

Additional port changes:

• Changed to DISTVERSION
• Added LICENSE_FILE, removed LICENSE_FILE_GPLv2
• Removed net/rdesktop dependency from RUN_DEPENDS (converted to option)
• Added NO_ARCH
• Added options DOCS,FREERDP,RDESKTOP and corresponding dependencies

PR: 225468
Submitted by: owk <freebsd_ports@k-worx.org>
Approved by: portmgr (maintainer timeout, 14 days)
Approved by: tcberner (mentor, implicit)