Recent OBJDIR changes can cause host /etc files to leak into DESTDIR -- Fixed in r325416

[Jamie Landeg-Jones]

Somewhat related, (I think!) "make LINT" in the kernel-config directory
no longer works as expected unless MAKEOBJDIRPREDIX=/ is set, i.e.:

cd /usr/src/sys/ARCH/conf/ && make MAKEOBJDIRPREFIX=/ LINT

cheers, Jamie