core: Allow to query info about the emacn integration.
02a4f2fa0d8c
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Description

core: Allow to query info about the emacn integration.

* pinentry/pinentry-emacs.c (pinentry_emacs_status): New.
* pinentry/pinentry.c (cmd_getinfo): Add emacs info getinfo.

With this patch the pinentry launched info of gpg coveys an additional
item. For example:

gpg: pinentry launched (2850 gtk2 1.1.1-beta29 \

/dev/pts/42 xterm localhost:10.0 20620/1000/5 1450/2450 -)

The last item "-" is new with the follwing meaning:

= No support for emacs at all in pinentry (configure --disable-inside-emacns) 0 = INSIDE_EMACS envvar not set, allow-emacs-pinentry not in gpg-agent.conf, or emacs pinentry server not started. 1 = Prepared for connecting to Emacs but may fallback to standard pinentry on connection failure 2 = Connection to Emacs pinnetry server has been established.