core: Handle multiple TOFU_USER lines in verify
* src/verify.c (op_data_t): Add conflict_user_seen. (parse_tofu_user): Return ERR_DUP_VALUE for mutltiple TOFU_USERS. (_gpgme_verify_status_handler): Handle ERR_DUP_VALUE from parse_tofu_user to ignore the next TOFU_STATS.
This fixes TOFU Conflict verification with GnuPG-2.1.17 and 2.1.18
- GnuPG-Bug-Id: T2914