ecc-sos: Fix gpg-agent for SOS handling.
* agent/cvt-openpgp.c (scan_pgp_format): New. (do_unprotect): Fix NBITS in SOS. Use scan_pgp_format. (convert_from_openpgp_main): Always use opaque MPI. Use GCRYMPI_FLAG_USER1 for encrypted data.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>