Download new package lists (either from upstream, or from apt-cacher)

every time we update builder. When get-upstream-dists' codepath to
update from apt-cacher-ng cache is triggered we might get old(er) files,
but hopefully it won't cause problems.

tools/builder-cronjob

@@ -12,6 +12,9 @@
 # Update our bzr checkout
 /srv/builder/tools/update_builder.sh
 
+# Update package lists accessed by builder
+/srv/builder/tools/get-upstream-dists
+
 # Run cronwrapper to update builder
 /srv/builder/tools/cronwrapper /srv/logs/update_gnewsense \
 	'cd /srv/builder/ && linux32 ./do-update && ./push-repo'