core: Support GPGME_AUDITLOG_DIAG for gpgsm.
* src/engine-gpgsm.c (struct engine_gpgsm): Add fields diag_cb and diagnostics. (close_notify_handler): Close the diag fd on status fd close. Handle diag close. (gpgsm_cancel): Handle diag. (gpgsm_release): Free DIAGNOSTICS. (gpgsm_new): Support the diag feature. (start): Set a handler for the diag fd. (gpgsm_getauditlog): Support GPGME_AUDITLOG_DIAG.
- Co-authored-by: Andre Heinecke <email@example.com>
- Signed-off-by: Werner Koch <firstname.lastname@example.org>