Change lib name during make, not install.

mk/scripts.mk

@@ -33,6 +33,6 @@ install: realinstall ${INSTALLAFTER}
 # A lot of scripts don't have anything to clean
 # Also, some rm implentation require a file argument regardless of error
 # so we ensure that it has a bogus argument
-CLEANFILES?=	.bogus
+CLEANFILES+=	${OBJS}
 clean:
-	rm -f ${OBJS} ${CLEANFILES}
+	if test -n "${CLEANFILES}"; then rm -f ${CLEANFILES}; fi