Really make the tool directory singular in intl

pkg/intl/tool/generate_locale_data_files.dart

Index: pkg/intl/tool/generate_locale_data_files.dart
===================================================================
--- pkg/intl/tool/generate_locale_data_files.dart	(revision 12515)
+++ pkg/intl/tool/generate_locale_data_files.dart	(working copy)
@@ -12,10 +12,10 @@
  * which is sourced by the date_symbol_data... files.
  */
 
-#import('../date_symbols.dart');
-#import('../date_symbol_data_local.dart');
-#import('../date_time_patterns.dart');
-#import('../date_format.dart');
+#import('../lib/date_symbols.dart');
+#import('../lib/date_symbol_data_local.dart');
+#import('../lib/date_time_patterns.dart');
+#import('../lib/date_format.dart');
 #import('dart:io');
 #import('dart:json');
 #import('../test/data_directory.dart');