Closes https://github.com/pyodide/pyodide/issues/604

This creates an installable `pyodide-build` Python package that we can also upload to PyPi under https://pypi.org/project/pyodide-build/ (currently uploaded the dev version to reserve the name).

There is also the identically named `pyodide-build` CLI command which replaces `bin/pyodide`.

The short term goals is to use fewer hacks with `PATH` and `PYTHONPATH`. Long term goal make it a user facing interface for building packages instead of the Makefile.
Create an installable pyodide-build package. Closes https://github.com/pyodide/pyodide/issues/604

This creates an installable `pyodide-build` Python package that we can also upload to PyPi under https://pypi.org/project/pyodide-build/ (currently uploaded the dev version to reserve the name).

There is also the identically named `pyodide-build` CLI command which replaces `bin/pyodide`.

The short term goals is to use fewer hacks with `PATH` and `PYTHONPATH`. Long term goal make it a user facing interface for building packages instead of the Makefile.
package:
  name: cytoolz
  version: 0.11.0
source:
  sha256: c64f3590c3eb40e1548f0d3c6b2ccde70493d0b8dc6cc7f9f3fec0bb3dcd4222
  url: https://files.pythonhosted.org/packages/58/67/1c60da8ba831bfefedb64c78b9f6820bdf58972797c95644ee3191daf27a/cytoolz-0.11.0.tar.gz
requirements:
  run:
  - nose
  - toolz
test:
  imports:
  - cytoolz

package:
  name: cytoolz
  version: 0.11.0
source:
  sha256: c64f3590c3eb40e1548f0d3c6b2ccde70493d0b8dc6cc7f9f3fec0bb3dcd4222
  url: https://files.pythonhosted.org/packages/58/67/1c60da8ba831bfefedb64c78b9f6820bdf58972797c95644ee3191daf27a/cytoolz-0.11.0.tar.gz
requirements:
  run:
  - nose
  - toolz
test:
  imports:
  - cytoolz
