Makefiles: Call OS9ATTR with multiple files (part 1) Instead of spawning a os9 process for each file, call it once with the whole bunch of files. This can speed up the build process significantly when applied globally. For now, do the special cases having "notdir".

* Echo welcome message
echo * Welcome to NitrOS-9 Level 2 *
echo *      with DriveWire 4       *
echo *   on the Color Computer 3   *
echo
* Lock shell and std utils into memory
link shell
load utilpak1
date -t