* src/gpgme.h.in (GPGME_DECRYPT_LISTONLY): New.
* src/decrypt.c (op_data_t): Add member list_only.
(_gpgme_decrypt_status_handler): Do not return NO_DATA in list_only
mode.
(_gpgme_op_decrypt_init_result): Add arg flags and set the list_only
flag.
(_gpgme_decrypt_start): Pss flags to the init function.
* src/decrypt-verify.c (decrypt_verify_start): Ditto.
* src/engine-gpg.c (gpg_decrypt): Add --list-only if flag is set.
* tests/run-decrypt.c (main): Add option --list-only.
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