Add new internal function to get the encoded issuer
* src/cert.c (_ksba_cert_get_issuer_dn_ptr): New. (_ksba_cert_get_serial_ptr): Return the full DER encoding and not just the value. * src/ocsp.c (ksba_ocsp_prepare_request): Adjust for this change.
- Signed-off-by: Werner Koch <wk@gnupg.org>