Pass --architectures to 'lb config', to make it easier to build images

for a different architecture.

debian/changelog

@@ -4,6 +4,8 @@ livecd-rootfs (2.76) UNRELEASED; urgency=low
     - Don't try to install an empty task name when building an image without
       a live task.
     - Fix installation of ubuntu-server fstab removal hook.
+    - Pass --architectures to 'lb config', to make it easier to build images
+      for a different architecture.
 
  -- Colin Watson <cjwatson@ubuntu.com>  Thu, 23 Aug 2012 09:43:38 +0100
 

live-build/auto/config

@@ -300,6 +300,7 @@ esac
 lb config noauto \
 	--mode ubuntu \
 	--distribution "$SUITE" \
+	--architectures "$ARCH" \
 	--bootstrap-keyring ubuntu-keyring \
 	--binary-images "$BINARY_IMAGES" \
 	--memtest "$MEMTEST" \