On Windows, don't encode filenames in the import machinery

Python/pythonrun.c

 
 /* Python interpreter top-level routines, including init/exit */
 
 #include "Python.h"
 
 #include "Python-ast.h"
 #undef Yield /* undefine macro conflicting with winbase.h */
 #include "grammar.h"
 #include "node.h"
 #include "token.h"
@@ skipping 771 matching lines @@
 
 void
 Py_EndInterpreter(PyThreadState *tstate)
 {
     PyInterpreterState *interp = tstate->interp;
 
     if (tstate != PyThreadState_GET())
         Py_FatalError("Py_EndInterpreter: thread is not current");
     if (tstate->frame != NULL)
         Py_FatalError("Py_EndInterpreter: thread still has a frame");
+
+    wait_for_thread_shutdown();
+
     if (tstate != interp->tstate_head || tstate->next != NULL)
         Py_FatalError("Py_EndInterpreter: not the last thread");
 
     PyImport_Cleanup();
     PyInterpreterState_Clear(interp);
     PyThreadState_Swap(NULL);
     PyInterpreterState_Delete(interp);
 }
 
 #ifdef MS_WINDOWS
@@ skipping 1286 matching lines @@
     PyCompilerFlags flags;
     PyArena *arena;
 
     arena = PyArena_New();
     if (arena == NULL)
         return NULL;
 
     flags.cf_flags = 0;
     mod = PyParser_ASTFromStringObject(str, filename, start, &flags, arena);
     if (mod == NULL) {
-        Py_DECREF(filename);
         PyArena_Free(arena);
         return NULL;
     }
     st = PySymtable_BuildObject(mod, filename, 0);
-    Py_DECREF(filename);
     PyArena_Free(arena);
     return st;
 }
 
 struct symtable *
 Py_SymtableString(const char *str, const char *filename_str, int start)
 {
     PyObject *filename;
     struct symtable *st;
 
@@ skipping 688 matching lines @@
 #undef PyRun_InteractiveLoop
 PyAPI_FUNC(int)
 PyRun_InteractiveLoop(FILE *f, const char *p)
 {
     return PyRun_InteractiveLoopFlags(f, p, NULL);
 }
 
 #ifdef __cplusplus
 }
 #endif