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: fpcast-test
  version: "0.1"
  _tag: pyodide.test
  top-level:
    - fpcast_test
source:
  path: fpcast-test

package:
  name: fpcast-test
  version: "0.1"
  _tag: pyodide.test
  top-level:
    - fpcast_test
source:
  path: fpcast-test
