client: Handle inquiry from server with CONFIDENTIAL.
* src/assuan-defs.h (struct assuan_context_s): Add new flags, in_inq_cb and confidential_inquiry. * src/client.c (assuan_transact): Use the new flags to wipe the outbound buffer for inquiry when CONFIDENTIAL. * src/context.c (assuan_set_flag): When ASSUAN_CONFIDENTIAL is set in inquire callback, set the confidential_inquiry flag.
- GnuPG-bug-id: T5977
- Signed-off-by: NIIBE Yutaka <email@example.com>