Hide deprecated functions in ec.h

use LCRYPTO_UNUSED and remove the LIBRESSL_INTERNAL guard

ok tb@

Merge ecdh.h into ec.h

The remaining two ECDH interfaces are relocated into ec.h. ecdh.h
remains. It does nothing but include ec.h.

ok jsing

Merge ecdsa.h into ec.h

Move the remaining ECDSA API into ec.h to match OpenSSL 1.1's interface
better. In particular, the EC_KEY sign and verify method accessors are
moved to the right header. Whe

Merge ecdsa.h into ec.h

Move the remaining ECDSA API into ec.h to match OpenSSL 1.1's interface
better. In particular, the EC_KEY sign and verify method accessors are
moved to the right header. Whether the rest of the ECDSA stuff belongs
there is debatable, but that was upstream's choice.

ok jsing

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Unbreak the namespace build after a broken mk.conf and tool misfire had
me aliasing symbols not in the headers I was procesing.

This unbreaks the namespace build so it will pass again

ok tb@

Hide symbols in hkdf, evp, err, ecdsa and ec

ok jsing@