ok? games/sauerbraten diff add ppc

Tested on current, barely playable on my machine but works fine.

Index: games/sauerbraten/Makefile
===================================================================
RCS file: /cvs/ports/games/sauerbraten/Makefile,v
retrieving revision 1.8
diff -u -p -u -r1.8 Makefile
--- games/sauerbraten/Makefile 14 Jul 2019 02:16:51 -0000 1.8
+++ games/sauerbraten/Makefile 1 Jun 2020 22:25:16 -0000
@@ -1,6 +1,6 @@
# $OpenBSD: Makefile,v 1.8 2019/07/14 02:16:51 naddy Exp $

-ONLY_FOR_ARCHS= i386 amd64
+ONLY_FOR_ARCHS= i386 amd64 macppc

COMMENT-main= sauerbraten client
COMMENT-data= sauerbraten data