With this change the "refresh" make target doesn't any longer exists.
It was merged into the "client" target. One will need a "make clean"
before building yQ2 after this change.
These are the code changes and Makefile changes necessary to build and
run Yamagi Quake II on Max OS X. OS X 10.6 or higher is required, older
version may work but we cannot guarantee it. The documentation will be
added in another commit. This patch was contributed by W. Beser, I made
only some small cosmetical changes.