Mark emulators/BasiliskII BROKEN-sparc64

This hasn't ever worked. ok to mark it BROKEN for sparc64?

--Kurt

Index: Makefile
===================================================================
RCS file: /cvs/ports/emulators/BasiliskII/Makefile,v
retrieving revision 1.43
diff -u -p -r1.43 Makefile
--- Makefile 26 Jan 2020 11:14:31 -0000 1.43
+++ Makefile 25 Mar 2020 05:09:05 -0000
@@ -1,5 +1,7 @@
# $OpenBSD: Makefile,v 1.43 2020/01/26 11:14:31 jasper Exp $

+BROKEN-sparc64= Fails to compile in obj/sigsegv.o
+
COMMENT= open source 68k Macintosh emulator

DISTNAME= BasiliskII_src_01052006