Updated runtime files.  Remove version checks for Vim older than 6.0.
diff --git a/runtime/syntax/ahdl.vim b/runtime/syntax/ahdl.vim
index b1417c3..82f3918 100644
--- a/runtime/syntax/ahdl.vim
+++ b/runtime/syntax/ahdl.vim
@@ -3,11 +3,8 @@
 " Maintainer:	John Cook <john.cook@kla-tencor.com>
 " Last Change:	2001 Apr 25
 
-" 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
 
@@ -66,29 +63,21 @@
 syn sync minlines=1
 
 " 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_ahdl_syn_inits")
-  if version < 508
-    let did_ahdl_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>
 
-  " The default highlighting.
-  HiLink ahdlNumber		ahdlString
-  HiLink ahdlMegafunction	ahdlIdentifier
-  HiLink ahdlSpecialChar	SpecialChar
-  HiLink ahdlKeyword		Statement
-  HiLink ahdlString		String
-  HiLink ahdlComment		Comment
-  HiLink ahdlIdentifier		Identifier
-  HiLink ahdlOperator		Operator
-  HiLink ahdlTodo		Todo
+" The default highlighting.
+HiLink ahdlNumber		ahdlString
+HiLink ahdlMegafunction	ahdlIdentifier
+HiLink ahdlSpecialChar	SpecialChar
+HiLink ahdlKeyword		Statement
+HiLink ahdlString		String
+HiLink ahdlComment		Comment
+HiLink ahdlIdentifier		Identifier
+HiLink ahdlOperator		Operator
+HiLink ahdlTodo		Todo
 
-  delcommand HiLink
-endif
+delcommand HiLink
 
 let b:current_syntax = "ahdl"
 " vim:ts=8