Packages the distutils stdlib module as a standalone package,
```
377K distutils.data
221K distutils.data.br
19K distutils.js
```
to reduce the minimal pyodide size.

Part of #1542 

This also,
 - adds documentation on what's supported or not in the stdlib
 - makes a few changes to `pyodide_build/buildall.py` to be able to add such stdlib packages as a dependency in other packages (which didn't work before). For instance, until there is a release with https://github.com/pypa/packaging/pull/396 micropip has a dependency on distutils.
Unvendor distutils. Packages the distutils stdlib module as a standalone package,
```
377K distutils.data
221K distutils.data.br
19K distutils.js
```
to reduce the minimal pyodide size.

Part of #1542 

This also,
 - adds documentation on what's supported or not in the stdlib
 - makes a few changes to `pyodide_build/buildall.py` to be able to add such stdlib packages as a dependency in other packages (which didn't work before). For instance, until there is a release with https://github.com/pypa/packaging/pull/396 micropip has a dependency on distutils.
package:
  name: patsy
  version: 0.5.1

source:
  url: https://files.pythonhosted.org/packages/49/c7/b971d8685c52512dbaa45bf8d076695432245a9f59509fb20a6c8e4ff69a/patsy-0.5.1.tar.gz
  sha256: f115cec4201e1465cd58b9866b0b0e7b941caafec129869057405bfe5b5e3991


requirements:
  run:
    - numpy
    - six

test:
  imports:
    - patsy

package:
  name: patsy
  version: 0.5.1

source:
  url: https://files.pythonhosted.org/packages/49/c7/b971d8685c52512dbaa45bf8d076695432245a9f59509fb20a6c8e4ff69a/patsy-0.5.1.tar.gz
  sha256: f115cec4201e1465cd58b9866b0b0e7b941caafec129869057405bfe5b5e3991


requirements:
  run:
    - numpy
    - six

test:
  imports:
    - patsy
