contrib/packaging/inno/requirements.txt.in

--- a/contrib/packaging/inno/requirements.txt.in	Mon Oct 21 19:28:23 2019 -0700
+++ b/contrib/packaging/inno/requirements.txt.in	Mon Oct 21 19:53:30 2019 -0700
@@ -2,3 +2,6 @@
 dulwich
 keyring
 pygments
+# Need to list explicitly so dependency gets pulled in when
+# not running on Windows.
+pywin32-ctypes