gpg: Avoid error diagnostics with --override-session-key.
gpg: Avoid error diagnostics with --override-session-key.

* src/engine-gpg.c (gpg_decrypt): Add --no-keyring.
--

GnuPG-bug-id: 3464
Signed-off-by: Werner Koch <13bd1fc5137f503b0a8355ad400e7a87ebb45b25@gnupg.org>

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme