Updated runtime files.  Remove version checks for Vim older than 6.0.
diff --git a/runtime/syntax/xxd.vim b/runtime/syntax/xxd.vim
index b2b1e44..1145ebc 100644
--- a/runtime/syntax/xxd.vim
+++ b/runtime/syntax/xxd.vim
@@ -6,11 +6,8 @@
 " Notes:		use :help xxd   to see how to invoke it
 " URL:	http://www.drchip.org/astronaut/vim/index.html#SYNTAX_XXD
 
-" 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
 
@@ -20,22 +17,14 @@
 syn match xxdDot	contained	"[.\r]"
 
 " Define the default highlighting.
-" For version 5.7 and earlier: only when not done already
-" For version 5.8 and later: only when an item doesn't have highlighting yet
-if version >= 508 || !exists("did_xxd_syntax_inits")
-  if version < 508
-    let did_xxd_syntax_inits = 1
-    command -nargs=+ HiLink hi link <args>
-  else
-    command -nargs=+ HiLink hi def link <args>
-  endif
+" Only when an item doesn't have highlighting yet
+command -nargs=+ HiLink hi def link <args>
 
- HiLink xxdAddress	Constant
- HiLink xxdSep		Identifier
- HiLink xxdAscii	Statement
+HiLink xxdAddress	Constant
+HiLink xxdSep		Identifier
+HiLink xxdAscii	Statement
 
- delcommand HiLink
-endif
+delcommand HiLink
 
 let b:current_syntax = "xxd"