Inform a user about inquire length limit.
* common/status.h (INQUIRE_MAXLEN): New. * g10/call-agent.c (default_inquire_cb): Send STATUS_INQUIRE_MAXLEN. client when inquiring a passphrase over pinentry-loopback.
This is to inform a user about the maximum length of a passphrase. The
limit is the same that gpg-agent uses.