SSL_CTX_has_client_custom_ext - check whether a handler exists for a particular
client extension type
int SSL_CTX_has_client_custom_ext(const SSL_CTX *ctx, unsigned int ext_type);
SSL_CTX_has_client_custom_ext() checks whether a handler has been set for
a client extension of type ext_type using
Returns 1 if a handler has been set, 0 otherwise.
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