Function SSL_CTX_set_alpn_select_cb

pub unsafe extern "C" fn SSL_CTX_set_alpn_select_cb(
    ctx: *mut ssl_ctx_st,
    cb: Option<unsafe extern "C" fn(_: *mut ssl_st, _: *mut *const u8, _: *mut u8, _: *const u8, _: u32, _: *mut c_void) -> i32>,
    arg: *mut c_void,
)