Function SSL_CTX_set_tlsext_servername_callback__fixed_rust

pub unsafe fn SSL_CTX_set_tlsext_servername_callback__fixed_rust(
    ctx: *mut SSL_CTX,
    cb: Option<unsafe extern "C" fn(_: *mut SSL, _: *mut c_int, _: *mut c_void) -> c_int>,
) -> c_long