setup now just creates an empty file. When main starts and loads it in,
it stats and if zero size init's a new location and saves it back out.
Now games.tgz can be shared among MACHINE_ARCH's
This merges in all such remaining changes from the Linux port of the
NetBSD games, except in hunt (where substantial changes from OpenBSD
need to be looked at).
Some such changes were previously covered in PRs bin/6041, bin/6146,
bin/6148, bin/6150, bin/6151, bin/6580, bin/6660, bin/7993, bin/7994,
bin/8039, bin/8057 and bin/8093.
jmc