MFC r262036

etcupdate should use the src tree from where the release is built, not
the default (/usr/src) tree.

release/Makefile

@@ -105,7 +105,7 @@ base.txz:
 	sh ${.CURDIR}/scripts/mm-mtree.sh -m ${WORLDDIR} -F \
 	    "TARGET_ARCH=${TARGET_ARCH} TARGET=${TARGET}" -D "${.OBJDIR}/${DISTDIR}/base"
 	etcupdate extract -B -M "TARGET_ARCH=${TARGET_ARCH} TARGET=${TARGET}" \
-	    -d "${.OBJDIR}/${DISTDIR}/base/var/db/etcupdate"
+	    -s ${WORLDDIR} -d "${.OBJDIR}/${DISTDIR}/base/var/db/etcupdate"
 # Package all components
 	cd ${WORLDDIR} && ${IMAKE} packageworld DISTDIR=${.OBJDIR}/${DISTDIR}
 	mv ${DISTDIR}/*.txz .