Function wolfSSL_CTX_set_next_proto_select_cb 

pub unsafe extern "C" fn wolfSSL_CTX_set_next_proto_select_cb(
    s: *mut WOLFSSL_CTX,
    cb: Option<unsafe extern "C" fn(ssl: *mut WOLFSSL, out: *mut *mut c_uchar, outlen: *mut c_uchar, in_: *const c_uchar, inlen: c_uint, arg: *mut c_void) -> c_int>,
    arg: *mut c_void,
)