Fix wasm compilation using dart.library.io

[nohli]

Fixes #244

You can try this PR with using this in your pubspec.yaml:

dependency_overrides:
  vector_graphics_compiler:
    git:
      url: https://github.com/nohli/vector_graphics
      path: packages/vector_graphics_compiler
      ref: io

I've created two PRs. Both work for me when using https://pub.dev/packages/flutter_svg.

[nohli]

This is fixed in the latest Flutter stable release 3.22.3.