Check for USETOOLS!=yes in addition to MKTOOLS==no to generate the empty rule

sets. Otherwise platforms not running the new toolchain will end up with
lossage as tools attempt to get built and installed into /bin (due to
bsd.own.mk properly checking USETOOLS before setting up a default TOOLDIR).
Don't print the warning unless MKTOOLS=no

tools/Makefile

@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.17 2001/11/13 16:17:24 tv Exp $
+#	$NetBSD: Makefile,v 1.18 2001/11/22 00:13:10 jmc Exp $
 
 .include <bsd.own.mk>
 
@@ -16,13 +16,17 @@ SUBDIR=	mkdep .WAIT \
 		asn1_compile compile_et config lint1 msgc menuc mklocale
 .endif
 
-.if ${MKTOOLS:Uyes} == "no"
+.if ${MKTOOLS:Uyes} == "no" || ${USETOOLS} != "yes"
 realall install: _warn
+.if ${MKTOOLS} == "no"
 _warn:
 	@echo '*** WARNING: "MKTOOLS" is set to "no"; this will prevent building and'
 	@echo '*** updating your host toolchain.  This should be used only as a'
 	@echo '*** temporary workaround for toolchain problems, as it will result'
 	@echo '*** in version skew and build errors onver time!'
+.else
+_warn:
+.endif
 
 .for dir in ${SUBDIR:N.WAIT}
 all-${dir} depend-${dir} dependall-${dir} install-${dir}: