tools: Give mime parser callbacks access to the rfc822 parser.
* tools/mime-parser.c (mime_parser_context_s): Add field MSG. (parse_message_cb): Set it. (mime_parser_rfc822parser): New. * tools/mime-parser.h: Declare rfc822parse_t for the new prototype.
- Signed-off-by: Werner Koch <wk@gnupg.org>