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: mpmath
  version: 1.2.1
  top-level:
    - mpmath
source:
  sha256: 604bc21bd22d2322a177c73bdb573994ef76e62edd595d17e00aff24b0667e5c
  url: https://files.pythonhosted.org/packages/d4/cf/3965bddbb4f1a61c49aacae0e78fd1fe36b5dc36c797b31f30cf07dcbbb7/mpmath-1.2.1-py3-none-any.whl
about:
  home: http://mpmath.org/
  PyPI: https://pypi.org/project/mpmath
  summary: Python library for arbitrary-precision floating-point arithmetic
  license: BSD

package:
  name: mpmath
  version: 1.2.1
  top-level:
    - mpmath
source:
  sha256: 604bc21bd22d2322a177c73bdb573994ef76e62edd595d17e00aff24b0667e5c
  url: https://files.pythonhosted.org/packages/d4/cf/3965bddbb4f1a61c49aacae0e78fd1fe36b5dc36c797b31f30cf07dcbbb7/mpmath-1.2.1-py3-none-any.whl
about:
  home: http://mpmath.org/
  PyPI: https://pypi.org/project/mpmath
  summary: Python library for arbitrary-precision floating-point arithmetic
  license: BSD
