Franz SUN 3 compile of 3/17/88 pcl

[fritzson@PRC.Unisys.COM (Richard Fritzson)]

In order to compile the current "St. Patricks Day" release of PCL
using ExCL on the SUN3, it is necessary to get :SUN3 into your
*features* list. Otherwise not all of the essentail parts of FIN.LISP
will be compiled.

Inserting 

	#+excl (push :sun3 *features*)

into the list of "various hacks" near the top of defsys.lisp
worked for me. I'm not certain offhand what the "correct" way to do this is.