gpg: Add a DECRYPTION_INFO status.
* common/status.h (STATUS_DECRYPTION_INFO): New. * g10/encr-data.c: Include status.h. (decrypt_data): Emit STATUS_DECRYPTION_INFO line.
DECRYPTION_INFO <mdc_method> <sym_algo>
Print information about the symmetric encryption algorithm and the MDC method. This will be emitted even if the decryption fails.