Update the text on the Expat module and library.

Modules/Setup.dist

@@ -450,25 +450,17 @@ GLHACK=-Dclear=__GLclear
 
 # Interface to the Expat XML parser
 #
-# Expat is written by James Clark and must be downloaded separately
-# (see below).  The pyexpat module was written by Paul Prescod after a
-# prototype by Jack Jansen.
+# Expat was written by James Clark and is now maintained by a group of
+# developers on SourceForge; see www.libexpat.org for more
+# information.  The pyexpat module was written by Paul Prescod after a
+# prototype by Jack Jansen.  Source of Expat 1.95.2 is included in
+# Modules/expat/.  Usage of a system shared libexpat.so/expat.dll is
+# not advised.
 #
-# The Expat dist includes Windows .lib and .dll files.  Home page is at
-# http://www.jclark.com/xml/expat.html, the current production release is
-# always ftp://ftp.jclark.com/pub/xml/expat.zip.
+# More information on Expat can be found at www.libexpat.org.
 #
-# EXPAT_DIR, below, should point to the expat/ directory created by
-# unpacking the Expat source distribution.
-#
-# Note: the expat build process doesn't yet build a libexpat.a; you can
-# do this manually while we try convince the author to add it.  To do so,
-# cd to EXPAT_DIR, run "make" if you have not done so, then run:
-#
-#    ar cr libexpat.a xmltok/*.o xmlparse/*.o
-#
-#EXPAT_DIR=/usr/local/src/expat
-#pyexpat pyexpat.c -I$(EXPAT_DIR)/xmlparse -L$(EXPAT_DIR) -lexpat
+#EXPAT_DIR=/usr/local/src/expat-1.95.2
+#pyexpat pyexpat.c -DHAVE_EXPAT_H -I$(EXPAT_DIR)/lib -L$(EXPAT_DIR) -lexpat
 
 
 # Example -- included for reference only: