PR/56207: Jan-Benedict Glaw: Handle error from find when removing CVS

directories on a git repo.

distrib/acorn32/stand/Makefile

@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.28 2014/01/22 01:03:09 christos Exp $
+#	$NetBSD: Makefile,v 1.29 2021/05/24 22:40:44 christos Exp $
 #
 
 .include <bsd.own.mk>
@@ -91,9 +91,9 @@ setup_tmp:
 	-rm -rf tmp
 	mkdir tmp
 	cp -R ${.CURDIR}/BtNetBSD tmp/
-	-find tmp -path '*/CVS/*' -type f -exec rm -rf {} \;
-	find tmp -name CVS -type d | xargs rmdir
-	find tmp -name '*.uue' -type f -exec rm -f {} \;
+	-find tmp -path '*/CVS/*' -type f -exec rm -rf {} +
+	-find tmp -name CVS -type d -exec rmdir {} +
+	-find tmp -name '*.uue' -type f -exec rm -f {} +
 
 .PHONY: settypes
 settypes: setup_tmp