gpgparsemail: Die on parse error (not abort).
* tools/gpgparsemail.c (parse_message): Don't use ERRNO. * tools/rfc822parse.c (transition_to_body): Return -1. (transition_to_header, insert_header): Likewise.
- GnuPG-bug-id: T1977
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>