Begin incorporating Python unit tests into build

We now build a separate APE binary for each test so they can run in
parallel. We've got 148 tests running fast and stable so far.

third_party/python/Modules/config.c

@@ -26,7 +26,6 @@ PyObject *PyInit__datetime(void);
 PyObject *PyInit__decimal(void);
 PyObject *PyInit__elementtree(void);
 PyObject *PyInit__functools(void);
-PyObject *PyInit__hashlib(void);
 PyObject *PyInit__heapq(void);
 PyObject *PyInit__io(void);
 PyObject *PyInit__json(void);