Ill just paste a diff that I tested, whitespace be damned!
--- bsd-games-2.13.ebuild.orig 2003-11-05 15:01:55.000000000 -0500
+++ bsd-games-2.13.ebuild 2003-11-05 16:11:23.000000000 -0500
@@ -51,6 +51,8 @@
dodoc AUTHORS BUGS COPYING ChangeLog ChangeLog.0 INSTALL \
README PACKAGING SECURITY THANKS TODO YEAR2000
+ dosed "s:/usr/games:${GAMES_BINDIR}:" ${GAMES_BINDIR}/wargames
+
# special subdirs
#[ `build_game atc` ] && dodir ${GAMES_DATADIR}/atc
#[ `build_game boggle` ] && dodir ${GAMES_DATADIR}/boggle