Updated runtime files.  Remove version checks for Vim older than 6.0.
diff --git a/runtime/syntax/wdiff.vim b/runtime/syntax/wdiff.vim
index 9cd0611..bdc7be7 100644
--- a/runtime/syntax/wdiff.vim
+++ b/runtime/syntax/wdiff.vim
@@ -9,11 +9,8 @@
 " SPAM is _NOT_ welcome - be ready to be reported!
 
 
-" For version 5.x: Clear all syntax items
-" For version 6.x: Quit when a syntax file was already loaded
-if version < 600
-  syn clear
-elseif exists("b:current_syntax")
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
   finish
 endif
 
@@ -23,21 +20,12 @@
 
 
 " 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_wdiff_syn_inits")
-  let did_wdiff_syn_inits = 1
-  if version < 508
-    let did_wdiff_syn_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 wdiffOld       Special
-  HiLink wdiffNew       Identifier
+HiLink wdiffOld       Special
+HiLink wdiffNew       Identifier
 
-  delcommand HiLink
-endif
+delcommand HiLink
 
 let b:current_syntax = "wdiff"