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.
#!/bin/bash

# get the absolute path to the root directory
ROOTDIR=$(python3 -c 'import pathlib, sys; \
                     print(pathlib.Path(sys.argv[1]).resolve().parents[1])' \
          "${BASH_SOURCE[0]}")

export PYTHONPATH="${PYTHONPATH}:${ROOTDIR}"
python3 -m pyodide_build "$@"

#!/bin/bash

# get the absolute path to the root directory
ROOTDIR=$(python3 -c 'import pathlib, sys; \
                     print(pathlib.Path(sys.argv[1]).resolve().parents[1])' \
          "${BASH_SOURCE[0]}")

export PYTHONPATH="${PYTHONPATH}:${ROOTDIR}"
python3 -m pyodide_build "$@"
