gpgsm: Use a cache for ISTRUSTED queries.
09d4b8f496dd
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Description

gpgsm: Use a cache for ISTRUSTED queries.

* sm/call-agent.c (struct istrusted_cache_s): New.
(istrusted_cache, istrusted_cache_valid): New.
(istrusted_cache_disabled): New.
(flush_istrusted_cache): New.
(struct istrusted_status_parm_s): New.
(istrusted_status_cb): Fill the cache.
(gpgsm_agent_istrusted): Implement a cache.

Not a really measurable performance improvements on Linux but maybe
somewhat on Windows (not yet tested). However, it does not clutter
the log files with IPC calls returning NOT_TRUSTED.

(cherry picked from commit ef2be95258d2e02659e96f6c4df5a9a1a233c8fd)