Register an EVP_PKEY_ASN1_METHOD in the global ASN.1 method table.
Declared in <openssl/evp.h>
<openssl/evp.h>
int EVP_PKEY_asn1_add0(EVP_PKEY_ASN1_METHOD const* ameth);
1 on success, or 0 on failure (for example duplicate id).