_PyImport_FixupExtension() and _PyImport_FindExtension() uses FS encoding

 * Rename _PyImport_FindExtension() to _PyImport_FindExtensionUnicode():
   the filename becomes a Unicode object instead of byte string
 * Rename _PyImport_FixupExtension() to _PyImport_FixupExtensionUnicode():
   the filename becomes a Unicode object instead of byte string
diff --git a/Include/import.h b/Include/import.h
index 3311581..3e81e78 100644
--- a/Include/import.h
+++ b/Include/import.h
@@ -40,8 +40,10 @@
 
 PyAPI_FUNC(void) _PyImport_ReInitLock(void);
 
-PyAPI_FUNC(PyObject *)_PyImport_FindExtension(char *, char *);
-PyAPI_FUNC(int)_PyImport_FixupExtension(PyObject*, char *, char *);
+PyAPI_FUNC(PyObject *)_PyImport_FindBuiltin(char *);
+PyAPI_FUNC(PyObject *)_PyImport_FindExtensionUnicode(char *, PyObject *);
+PyAPI_FUNC(int)_PyImport_FixupBuiltin(PyObject*, char *);
+PyAPI_FUNC(int)_PyImport_FixupExtensionUnicode(PyObject*, char *, PyObject *);
 
 struct _inittab {
     char *name;