Add *Update functions.
Add *Update functions.

Functions added are: DecryptVerifyUpdate, SignEncryptUpdate,
DecryptDigestUpdate and DigestEncryptUpdate.

wayf-dk/pkcs11,jsha/pkcs11,jsha/pkcs11,diogomonica/pkcs11,epim/pkcs11,miekg/pkcs11,diogomonica/pkcs11,wayf-dk/pkcs11,miekg/pkcs11,epim/pkcs11