Implement deterministic ECDSA as specified by rfc-6979.
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Description

Implement deterministic ECDSA as specified by rfc-6979.

* cipher/ecc.c (sign): Add args FLAGS and HASHALGO.  Convert an opaque
MPI as INPUT.  Implement rfc-6979.
(ecc_sign): Remove the opaque MPI code and pass FLAGS to sign.
(verify): Do not allocate and compute Y; it is not used.
(ecc_verify): Truncate the hash value if needed.
* tests/dsa-rfc6979.c (check_dsa_rfc6979): Add ECDSA test cases.