For those of us mere mortals who do not aspire to the lofty heights

of kernel hackery, add MAKE_JUST_WORLDS so that we can take part in
the 'make universe' goodnes without using unecessary time and resources.

Makefile

@@ -311,6 +311,7 @@ universe_${target}:
 	    "check _.${target}.buildworld for details" | ${MAKEFAIL}))
 	@echo ">> ${target} buildworld completed on `LC_ALL=C date`"
 .endif
+.if !defined(MAKE_JUST_WORLDS)
 .if exists(${.CURDIR}/sys/${target}/conf/NOTES)
 	@(cd ${.CURDIR}/sys/${target}/conf && env __MAKE_CONF=/dev/null \
 	    ${MAKE} LINT > ${.CURDIR}/_.${target}.makeLINT 2>&1 || \
@@ -319,6 +320,7 @@ universe_${target}:
 .endif
 	@cd ${.CURDIR} && ${MAKE} ${.MAKEFLAGS} TARGET=${target} \
 	    universe_kernels
+.endif
 	@echo ">> ${target} completed on `LC_ALL=C date`"
 .endfor
 universe_kernels: universe_kernconfs