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: zlib
  version: 1.2.11

source:
  sha256: c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1
  url: https://zlib.net/zlib-1.2.11.tar.gz

build:
  library: true
  script: |
     CFLAGS="-fPIC" emconfigure ./configure --prefix=$PWD
     emmake make install -j ${PYODIDE_JOBS:-3}

package:
  name: zlib
  version: 1.2.11

source:
  sha256: c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1
  url: https://zlib.net/zlib-1.2.11.tar.gz

build:
  library: true
  script: |
     CFLAGS="-fPIC" emconfigure ./configure --prefix=$PWD
     emmake make install -j ${PYODIDE_JOBS:-3}
