core: New export mode to export as OpenSSH public key.
* src/gpgme.h.in (GPGME_EXPORT_MODE_SSH): New. * src/export.c (export_ext_start): Allow for new mode. * src/engine-gpg.c (export_common): Implement. * tests/run-export.c (status_cb): New. (main): New options --status and --ssh.
- GnuPG-bug-id: T4310
- Signed-off-by: Werner Koch <wk@gnupg.org>