Update Emscripten binary wheels to include Emscripten platform tags. More work split off from #2591.

### Checklists

- [x] Add a [CHANGELOG](https://github.com/pyodide/pyodide/blob/main/docs/project/changelog.md) entry


# Needed for editable install
import setuptools

if __name__ == "__main__":
    setuptools.setup()

# Needed for editable install
import setuptools

if __name__ == "__main__":
    setuptools.setup()
