Issue #2443: Added a new macro, Py_VA_COPY, which is equivalent to C99
va_copy, but available on all python platforms.  Untabified a few
unrelated files.
diff --git a/Objects/abstract.c b/Objects/abstract.c
index fa2611a..d5a5d3c 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -2311,15 +2311,7 @@
     va_list countva;
     PyObject *result, *tmp;
 
-#ifdef VA_LIST_IS_ARRAY
-    memcpy(countva, va, sizeof(va_list));
-#else
-#ifdef __va_copy
-    __va_copy(countva, va);
-#else
-    countva = va;
-#endif
-#endif
+        Py_VA_COPY(countva, va);
 
     while (((PyObject *)va_arg(countva, PyObject *)) != NULL)
         ++n;