genromfs is special because it uses "PREFIX" in the meaning of DESTDIR
and "prefix" in the meaning of prefix. We were up to know using it
incorrectly for host: PREFIX shouldn't be set and only prefix should
be set.
Add an explanatory comment for this unusual behaviour.
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
40c560469f