gpg: Print a warning for too much data encrypted with 3DES et al.
416cf9e9be5d
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gpg: Print a warning for too much data encrypted with 3DES et al.

* g10/filter.h (cipher_filter_context_t): Remove unused filed
'create_mdc'.  Turn field 'header' into a bit field.  Add new fields
'short_blklen_warn' and 'short_blklen_count'.
* g10/cipher.c (write_header): Print a warning if MDC is not used.
(cipher_filter): Print a warning for long messages encrypted with a
short block length algorithm.

Note that to test this warning in a reliable way compression needs to
be disabled.