tools: fix getting all headers in iOS builds
tools: fix getting all headers in iOS builds

The arm64 version has all the headers, which may not be included, so
build that first, since it's used as the base when merging all
architectures.

zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc,zxcpoiu/react-native-webrtc