replace usage of Py_VA_COPY with the (C99) standard va_copy
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 85cdbb7..f0a9083 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -2874,9 +2874,8 @@
writer.min_length = strlen(format) + 100;
writer.overallocate = 1;
- /* va_list may be an array (of 1 item) on some platforms (ex: AMD64).
- Copy it to be able to pass a reference to a subfunction. */
- Py_VA_COPY(vargs2, vargs);
+ // Copy varags to be able to pass a reference to a subfunction.
+ va_copy(vargs2, vargs);
for (f = format; *f; ) {
if (*f == '%') {