common: Add OpenPGP<->Gcrypt pubkey id mapping functions.
* g10/misc.c (map_pk_gcry_to_openpgp): Move to ... * common/openpgp-oid.c (map_gcry_pk_to_openpgp): here and rename. Change all 4 callers. (map_openpgp_pk_to_gcry): New.
- Signed-off-by: Werner Koch <wk@gnupg.org>