Disable carla armhf arch, like upstream.

helpers/make-carla

 #!/bin/sh
 #
 #    Copyright (C) 2019 Mason Hock <mason@masonhock.com>
+#    Copyright (C) 2021 Luis Guzman <ark@switnet.org>
 #
 #    This program is free software; you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by
@@ -24,6 +25,10 @@ BACKPORTS=true
 
 . ./config
 
+#Set only for amd64 (no docs for armhf), more at
+#https://answers.launchpad.net/ubuntu/+source/carla/+question/698213
+sed -i "s|Architecture: any|Architecture: amd64 i386|g" debian/control
+
 changelog "Backported from ppa"
 
 compile