Add handler for T_FLUSHWIN trap in case old code makes use of it.

sys/arch/sparc64/sparc64/trap.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: trap.c,v 1.31 1999/11/06 20:24:51 eeh Exp $ */
+/*	$NetBSD: trap.c,v 1.32 1999/11/20 18:12:00 eeh Exp $ */
 
 /*
  * Copyright (c) 1996
@@ -774,6 +774,12 @@ badtrap:
 		ADVANCE;
 		break;
 
+	case T_FLUSHWIN:
+		/* Software window flush for v8 software */
+		write_all_windows();
+		ADVANCE;
+		break;
+
 	case T_RANGECHECK:
 		printf("T_RANGECHECK\n");	/* XXX */
 		ADVANCE;