Pass a long set to 1 to make the already specified crypto engine the default for (asymmetric) crypto operations.
This option has no effect unless set after CURLOPT_SSLENGINE.
CURLE_OK - Engine set as default.
CURLE_SSL_ENGINE_SETFAILED - Engine could not be set as default.
CURLE_NOT_BUILT_IN - Option not built in, OpenSSL is not the SSL backend.
CURLE_UNKNOWN_OPTION - Option not recognized.
CURLE_OUT_OF_MEMORY - Insufficient heap space.
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