graphics/xface.el: Remove

graphics/xface.el has failed to build for years and, although not
obvious, it has also been marked broken for years.

In toplevel form:
x-face.el:147:13: Warning: Package cl is deprecated
x-face.el:159:51: Warning: ``(defvar (,symbol) (,value) (,doc))' is a
   malformed function
x-face.el:803:1: Error: Symbol's function definition is void:
   string-to-int

An indicator that this software is abandonware is the latest
release (from MASTER_SITES) is approaching two decades in age.

Sponsored by: The FreeBSD Foundation