Uses mcpu in archflags instead of march, because this makes it easier to adjust for specific linking situations.
Uses mcpu in archflags instead of march, because this makes it easier to adjust for specific linking situations.

bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn,bakerstu/openmrn