When DeprecationWarning was silenced by default, it also silenced any use of -Q
by default as well. This change fixes that by treating -Q like -3 when it comes
to DeprecationWarning; using it causes the silencing to not occur.

Fixes issue #7319.
diff --git a/Lib/warnings.py b/Lib/warnings.py
index 134ba13..08b70af 100644
--- a/Lib/warnings.py
+++ b/Lib/warnings.py
@@ -384,7 +384,8 @@
 _processoptions(sys.warnoptions)
 if not _warnings_defaults:
     silence = [ImportWarning, PendingDeprecationWarning]
-    if not sys.py3kwarning:  # Don't silence DeprecationWarning if -3 was used.
+    # Don't silence DeprecationWarning if -3 or -Q was used.
+    if not sys.py3kwarning and not sys.flags.division_warning:
         silence.append(DeprecationWarning)
     for cls in silence:
         simplefilter("ignore", category=cls)