DOC: Added warning to patch_header.sh: Useless BACKUPDIR.

patches/utils/patch_header.sh

@@ -79,6 +79,7 @@ while test $# -gt 0; do
   ;;
  --backupdir*)
   BACKUPDIR="${1#--*=}"
+  echo "Warning: BACKUPDIR is not used currently."
   shift
   ;;
  *)