kbuild: make -j race fix, cosmetics

Yet another "make -j" race fixed, and
print the right number of spaces for consisting output

Makefile

@@ -464,7 +464,7 @@ include/config/MARKER: scripts/split-include include/linux/autoconf.h
 # 	if .config is newer than include/linux/autoconf.h, someone tinkered
 # 	with it and forgot to run make oldconfig
 
-include/linux/autoconf.h: .config
+include/linux/autoconf.h: .config scripts
 	$(Q)$(MAKE) $(build)=scripts/kconfig scripts/kconfig/conf
 	./scripts/kconfig/conf -s arch/$(ARCH)/Kconfig