core: Also allow GPGME_EXPORT_MODE_SSH for gpgme_op_export.
core: Also allow GPGME_EXPORT_MODE_SSH for gpgme_op_export.

* src/export.c (export_start): Allow that mode.
--

The test tools uses gpgme_op-export_ext and thus did not caught it.

Signed-off-by: Werner Koch <13bd1fc5137f503b0a8355ad400e7a87ebb45b25@gnupg.org>

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