Updated runtime files.  Remove version checks for Vim older than 6.0.
diff --git a/runtime/syntax/sgml.vim b/runtime/syntax/sgml.vim
index c0c3643..d60040c 100644
--- a/runtime/syntax/sgml.vim
+++ b/runtime/syntax/sgml.vim
@@ -5,11 +5,8 @@
 " Filenames:	*.sgml,*.sgm
 " $Id: sgml.vim,v 1.1 2004/06/13 17:52:57 vimboss Exp $
 
-" For version 5.x: Clear all syntax items
-" For version 6.x: Quit when a syntax file was already loaded
-if version < 600
-  syntax clear
-elseif exists("b:current_syntax")
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
   finish
 endif