FIX Change rust packages not to build concurrently. ### Description

Resolve #3565

### Checklists

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

package:
  name: distutils
  version: 1.0.0 # Nonsense
  tag:
    - always
  top-level:
    - distutils
build:
  type: cpython_module
  script: |
    cd $CPYTHONLIB

    tar --exclude=__pycache__ -cf - distutils | tar -C $DISTDIR -xf -

package:
  name: distutils
  version: 1.0.0 # Nonsense
  tag:
    - always
  top-level:
    - distutils
build:
  type: cpython_module
  script: |
    cd $CPYTHONLIB

    tar --exclude=__pycache__ -cf - distutils | tar -C $DISTDIR -xf -
