Put jisx0208.rb to under the library directory.

tool/enc-emoji-citrus-gen.rb

@@ -1,4 +1,4 @@
-require File.expand_path('../jisx0208', __FILE__)
+require File.expand_path('../lib/jisx0208', __FILE__)
 
 ENCODES = [
   {

tool/test/test_jisx0208.rb

@@ -1,6 +1,6 @@
 require 'test/unit'
 
-require_relative '../jisx0208'
+require_relative '../lib/jisx0208'
 
 class Test_JISX0208_Char < Test::Unit::TestCase
   def test_create_with_row_cell