a) "Fix" out-of-tree builds by not hard-coding locations of dsl files

with SYSTEM, and using instead PUBLIC entities gained from the catalog
in the directory of the language the document belongs to, or the
language-neutral entity.  Now we always use default.dsl as our dsl
master, and it grabs the necessary magic from the catalogs.

b) Fix the always-out-of-date imagelib problem with some make(1)-fu.

Approved by:	nik (ages ago)

share/sgml/catalog

@@ -1,7 +1,7 @@
   -- ...................................................................... --
   -- FreeBSD SGML Public Identifiers ...................................... --
   
-  -- $FreeBSD: doc/share/sgml/catalog,v 1.8 1999/11/14 17:57:31 nik Exp $
+  -- $FreeBSD: doc/share/sgml/catalog,v 1.9 2000/07/08 16:31:28 phantom Exp $
   --
 
   -- ...................................................................... --
@@ -17,6 +17,12 @@ PUBLIC "-//FreeBSD//DTD DocBook V3.1-Based Extension//EN"
 PUBLIC "-//FreeBSD//ENTITIES DocBook Manual Page Entities//EN" 
        "man-refs.ent"
 
+PUBLIC "-//FreeBSD//DOCUMENT DocBook Stylesheet//EN"
+	"freebsd.dsl"
+
+PUBLIC "-//FreeBSD//DOCUMENT DocBook Language Neutral Stylesheet//EN"
+	"freebsd.dsl"
+
   -- ...................................................................... --
   -- English specific ..................................................... --
 

share/sgml/default.dsl

@@ -0,0 +1,14 @@
+<!-- $FreeBSD: doc/share/sgml/freebsd.dsl,v 1.16 2000/07/25 18:23:45 ben Exp $ -->
+
+<!DOCTYPE style-sheet PUBLIC "-//James Clark//DTD DSSSL Style Sheet//EN" [
+<!ENTITY freebsd.dsl PUBLIC "-//FreeBSD//DOCUMENT DocBook Stylesheet//EN" CDATA DSSSL>
+]>
+
+<style-sheet>
+  <style-specification use="docbook">
+    <style-specification-body>
+    </style-specification-body>
+  </style-specification>
+
+  <external-specification id="docbook" document="freebsd.dsl">
+</style-sheet>