net_ssl: Use EVP API to create EVP_PKEYs when available #6
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The following functions are deprecated in OpenSSL 3.0 and used in net_ssl.cpp:
RSA_free,EC_KEY_free,RSA_new,RSA_generate_key_ex,EC_KEY_set_group,EC_KEY_generate_key.Since EVP_RSA_gen was added in OpenSSL 3.0 and since the aforementioned functions were deprecated in OpenSSL 3.0, I check if the OpenSSL version >= 3.0, and use EVP_RSA_gen instead of everything else up to assigning the private key to the certificate in
create_rsa_ssl_certificate.I also deleted
create_ec_ssl_certificatesince it wasn't used.