Trivial patch to fix build with --enable-build-with-cxx

[Eric Botcazou]

> 2011-05-02  Dmitry Gorbachev  <d.g.gorbachev@gmail.com>
>
> 	* parser.c (cp_parser_init_declarator): Replace false by NULL.

Replace by NULL_TREE instead and install under the obvious rule.

-- 
Eric Botcazou