Repair name lookup in classes for Py3.6+ after optimising module name lookups.
Repair name lookup in classes for Py3.6+ after optimising module name lookups.

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