[windows]: update_flutter_engine.bat is failing on latest flutter master channel

[clarkezone]

I'm on flutter master branch and have upgraded flutter to the latest version. When update_flutter_engine.bat is run either directly from cmd or as part of the windows desktop embedder library build, there are a bunch of errors eg:

file:///C:/Users/james/Source/github.com/clarkezone/flutter-desktop-embedding/third_party/dart_packages/crypto/lib/src/hash_sink.dart(20,9): error G7D2AEF3C: Type 'Endianness' not found.
1> final Endianness _endian;

[jason-simmons]

The version of the crypto package in https://github.com/google/flutter-desktop-embedding/tree/master/third_party/dart_packages/crypto needs to be updated to a newer release that uses the new Dart 2 Endian API.

@stuartmorgan

For now, you might be able to work around this by editing the tools/dart_tools/.packages file locally to point the crypto package at the latest version of https://github.com/dart-lang/crypto

[stuartmorgan]

Thanks all for the investigation and fix!

[clarkezone]

+1 all good now thx to all

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