Updated runtime files. Remove version checks for Vim older than 6.0.

runtime/syntax/reva.vim

@@ -7,13 +7,8 @@
 " Filetypes:	*.rf *.frt
 " NOTE: 	You should also have the ftplugin/reva.vim file to set 'isk'
 
-" For version 5.x: Clear all syntax items and don't load
-" For version 6.x: Quit when a syntax file was already loaded
-if version < 600
-  syntax clear
-  echo "Reva syntax file requires version 6.0 or later of vim!"
-  finish
-elseif exists("b:current_syntax")
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
    finish
 endif