#15545: fix sqlite3.iterdump regression on unsortable row_factory objects.

The fix for issue 9750 introduced a regression by sorting the row objects
returned by fetchall.  But if a row_factory such as sqlite3.Row is used, the
rows may not be sortable (in Python3), which leads to an exception.  The
sorting is still a nice idea, so the patch moves the sort into the sql.

Fix and test by Peter Otten.
diff --git a/Misc/NEWS b/Misc/NEWS
index 029c930..f4fb821 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -199,6 +199,10 @@
 Library
 -------
 
+- Issue #15545: Fix regression in sqlite3's iterdump method where it was
+  failing if the connection used a row factory (such as sqlite3.Row) that
+  produced unsortable objects. (Regression was introduced by fix for 9750).
+
 - Issue #16491: IDLE now prints chained exception tracebacks.
 
 - Issue #16828: Fix error incorrectly raised by bz2.compress(''). Patch by