Drop more files generated by live-build

If we don't drop them, they are kept forever and never updated
as wanted. This was problematic for live.list.chroot which
doesn't have the same content depending on the --initsystem option
we use.

auto/clean

@@ -2,5 +2,6 @@
 
 lb clean noauto "$@"
 rm -f config/binary config/bootstrap \
-      config/chroot config/common config/source
-rm -f binary.log prepare.log
+      config/chroot config/common config/source \
+      config/package-lists/live.list.chroot
+find config/hooks/ -type l | xargs --no-run-if-empty rm -f