agent: Add trustlist flag "de-vs".
* agent/trustlist.c (struct trustitem_s): Add field de_vs. (read_one_trustfile): Parse it. (istrusted_internal): Emit TRUSTLISTFLAG status line. * sm/gpgsm.h (struct rootca_flags_s): Add field de_vs. * sm/call-agent.c (istrusted_status_cb): Detect the flags. * sm/sign.c (write_detached_signature): Remove unused vars.
Right now this flag has no effect; we first need to specify the exact
behaviour.
- GnuPG-bug-id: T5079