Update Exult and use vorbis.

Formula/exult.rb

@@ -1,32 +1,31 @@
 require 'formula'
 
-# TODO we shouldn't be installing .apps if there is an option
-
 class Exult <Formula
-  # Use a specific revision that is known to compile (on Snow Leopard too.)
-  head 'http://exult.svn.sourceforge.net/svnroot/exult/exult/trunk', :revision => '6128'
+  head 'http://exult.svn.sourceforge.net/svnroot/exult/exult/trunk',
+          :revision => '6317'
   homepage 'http://exult.sourceforge.net/'
-  
+
   depends_on 'sdl'
   depends_on 'sdl_mixer'
-  
+  depends_on 'libvorbis'
+
   aka 'ultima7'
-  
+
   def install
     # Yes, really. Goddamnit.
     inreplace "autogen.sh", "libtoolize", "glibtoolize"
-    
+
     system "./autogen.sh"
     system "./configure", "--prefix=#{prefix}",
                           "--disable-debug",
                           "--disable-dependency-tracking",
                           "--disable-sdltest"
-                          
+
     system "make"
     system "make bundle"
     prefix.install "Exult.app"
   end
-  
+
   def caveats;
     "Cocoa app installed to #{prefix}\n\n"\
     "Note that this includes only the game engine; you will need to supply your own\n"\