Fix Pyston speedups (#281)

We remove (i.e. hide behind a debug ifdef) the recursion checking methods,
and the memory hooks and memory allocator methods. ASAN mode has no
PYMALLOC, so we need a macro. Fix build break with des.c stack allocation.

third_party/python/Include/abstract.h

@@ -35,7 +35,7 @@ PyObject *_PyObject_FastCallKeywords(PyObject *func, PyObject **args,
 PyObject *_PyObject_Call_Prepend(PyObject *func, PyObject *obj, PyObject *args,
                                  PyObject *kwargs);
 
-#ifdef USE_CHECKFUNCRESULT
+#if IsModeDbg()
 PyObject *_Py_CheckFunctionResult(PyObject *func, PyObject *result,
                                   const char *where);
 #else