[ruby/racc] Fix flag to `Regexp.new`

Probably intended to pass encoding "none".

https://github.com/ruby/racc/commit/65cd26efd8

lib/racc/statetransitiontable.rb

@@ -216,7 +216,7 @@ module Racc
         end
         i = ii
       end
-      Regexp.compile(map, 'n')
+      Regexp.compile(map, nil, 'n')
     end
 
     def set_table(entries, dummy, tbl, chk, ptr)