Failed on armv7s-apple-ios

I'm trying do a cross building for `armv7s-apple-ios` and `armv7-apple-ios`, I got a failure message:

```
thread 'main' panicked at 'don't know how to configure OpenSSL for armv7s-apple-ios'
```

It came from here, src/lib.js:275:

```
"wasm32-wasi" => "gcc",
"aarch64-apple-ios" => "ios64-cross",
"x86_64-apple-ios" => "iossimulator-xcrun",
_ => panic!("don't know how to configure OpenSSL for {}", target),
```

I've checked openssl lib, actually it supports the 32bit archs. How can I solve this?