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: glpk
  version: "4.65"

source:
  sha256: 4281e29b628864dfe48d393a7bedd781e5b475387c20d8b0158f329994721a10
  url: https://ftp.gnu.org/gnu/glpk/glpk-4.65.tar.gz

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

package:
  name: glpk
  version: "4.65"

source:
  sha256: 4281e29b628864dfe48d393a7bedd781e5b475387c20d8b0158f329994721a10
  url: https://ftp.gnu.org/gnu/glpk/glpk-4.65.tar.gz

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