x11/xbiff: Update to 1.0.4

Update x11/xbiff to 1.0.4
Add licensing information
Add missing dependencies
This is a maintenance release

Changelog:
https://lists.x.org/archives/xorg-announce/2019-July/003009.html

Obtained from: FreeBSD Graphics Team development repo

		https://github.com/FreeBSDDesktop/freebsd-ports/tree/feature/xorglibs