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: pandas
  version: 1.0.5

source:
  url: https://files.pythonhosted.org/packages/31/29/ede692aa6547dfc1f07a4d69e8411b35225218bcfbe9787e78b67a35d103/pandas-1.0.5.tar.gz
  sha256: 69c5d920a0b2a9838e677f78f4dde506b95ea8e4d30da25859db6469ded84fa8
  patches:
    - patches/fix_json_signature.patch

build:
  cflags: -Werror=implicit-function-declaration -Werror=mismatched-parameter-types -Werror=mismatched-return-types
  ldflags: --Wl,--fatal-warnings
requirements:
  run:
    - numpy
    - python-dateutil
    - pytz

test:
  imports:
    - pandas

package:
  name: pandas
  version: 1.0.5

source:
  url: https://files.pythonhosted.org/packages/31/29/ede692aa6547dfc1f07a4d69e8411b35225218bcfbe9787e78b67a35d103/pandas-1.0.5.tar.gz
  sha256: 69c5d920a0b2a9838e677f78f4dde506b95ea8e4d30da25859db6469ded84fa8
  patches:
    - patches/fix_json_signature.patch

build:
  cflags: -Werror=implicit-function-declaration -Werror=mismatched-parameter-types -Werror=mismatched-return-types
  ldflags: --Wl,--fatal-warnings
requirements:
  run:
    - distutils
    - numpy
    - python-dateutil
    - pytz

test:
  imports:
    - pandas
