Restore old PyEval_EvalCode() signature for older versions of PyPy (GH-4236)
Restore old PyEval_EvalCode() signature for older versions of PyPy (GH-4236)

Partially reverts https://github.com/cython/cython/commit/1027db04fb7c5bbfea2b9bcdfce0b1f384e26a93

cython/cython,da-woods/cython,scoder/cython,cython/cython,scoder/cython,scoder/cython,da-woods/cython,cython/cython,da-woods/cython,da-woods/cython,scoder/cython,cython/cython