Fixed a bug involving using char_delimiter with a true input iterator.

Thanks to David Abrahams for sending a example that demonstrated the problem


[SVN r22615]

libs/tokenizer

@@ -1 +1 @@
-Subproject commit 6719c70d3f931073ce9614c4d31b4d05885998e1
+Subproject commit 4e7357c63e5e50bffedaeac485614073465bae57