gpg: Remove MDC options
* g10/gpg.c: Turn options --force-mdc, --no-force-mdc, --disable-mdc and --no-disable-mdc into NOPs. * g10/encrypt.c (use_mdc): Simplify. MDC is now almost always used. * g10/cipher.c (write_header): Include extra hint and make translatable. * g10/options.h (struct opt): Remove fields force_mdc and disable_mdc.
The MDC is now always used except with --rfc2440 which will lead to a
a big fat warning.
This is a stripped down version of commit
253e8bdd9014cbe6dc06adce9d9dd2f8f4b31709 which could not directly be
applied due to the AEAD mechanisms there.
- Signed-off-by: Werner Koch <wk@gnupg.org>