Run core tests in Safari. Partially addresses https://github.com/pyodide/pyodide/issues/989

It runs, but there are several test failures, I'll open separate issues about those.
package:
  name: autograd
  version: "1.4"
  top-level:
    - autograd
source:
  sha256: 383de0f537ef2e38b85ff9692593b0cfae8958c9b3bd451b52c255fd9171ffce
  url: https://files.pythonhosted.org/packages/04/6d/63beeb8c1f1964aa7d84e59657c7f5b85f6ae009ed80f51e0d3ec78e0f97/autograd-1.4.tar.gz
requirements:
  host:
    - numpy
  run:
    - numpy
    - future
about:
  home: https://github.com/HIPS/autograd
  PyPI: https://pypi.org/project/autograd
  summary: Efficiently computes derivatives of numpy code.
  license: MIT

package:
  name: autograd
  version: "1.4"
  top-level:
    - autograd
source:
  sha256: 383de0f537ef2e38b85ff9692593b0cfae8958c9b3bd451b52c255fd9171ffce
  url: https://files.pythonhosted.org/packages/04/6d/63beeb8c1f1964aa7d84e59657c7f5b85f6ae009ed80f51e0d3ec78e0f97/autograd-1.4.tar.gz
requirements:
  host:
    - numpy
  run:
    - numpy
    - future
about:
  home: https://github.com/HIPS/autograd
  PyPI: https://pypi.org/project/autograd
  summary: Efficiently computes derivatives of numpy code.
  license: MIT
