ecc: Allow the use of an uncompressed public key.
* cipher/ecc.c (eddsa_encodepoint): Factor most code out to ... (eddsa_encode_x_y): new fucntion. (eddsa_decodepoint): Allow use of an uncompressed public key. * tests/t-ed25519.c (N_TESTS): Adjust. * tests/t-ed25519.inp: Add test 1025.