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Dart2Wasm doesn't officially support `dart:ffi` (only a small sketchy
subset needed in flutter web engine). We have seen user reporting issues
where existing packages don't work with dart2wasm due to using
`dart.library.ffi` in `bool.fromEnvironment` or in conditional imports
and it doing the wrong thing. So we're going to make `dart.library.ffi`
`false` in the compiler.
We therefore update the code to detect whether it runs under wasm via a
new `dart.tool.dart2wasm` environment variable.
This is a preparation for the change in dart2wasm which will start
making `const bool.fromEnvironment('dart.library.ffi')` return `false`
instead of `true`.
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