use find instead of ls to get list of order files.

this addresses the problem leading to bug 2394.

process/create-orders

@@ -16,8 +16,10 @@ else
   mv orders.dir "orders.dir.$TURN"
   mkdir -p orders.dir
 fi
-#shellcheck disable=2011
-ls -1rt "orders.dir.$TURN/turn-*" | xargs cat > "orders.$TURN"
+find orders.dir.$TURN -maxdepth 1 -type f -printf "%T+\t%p\n" | sort | cut -f2 | while read
+do
+  cat "$REPLY" >> orders.$TURN
+done
 
 lockfile -r3 -l120 orders.queue.lock
 if [ -e orders.queue ] ; then