Delete tests and code for ecdsa over curve25519.
* ecc-eh-to-a.c (ecc_eh_to_a): Require op == 0, delete code only used for non-standard ecdsa over curve25519. * testsuite/ecdsa-sign-test.c (test_main): Delete test of ecdsa over curve25519. * testsuite/ecdsa-verify-test.c (test_main): Likewise. * testsuite/ecdsa-keygen-test.c (test_main): Exclude curve25519 from test.
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