Add a duplicate check for our own advertisements.  This is necessary for dumb non simplex interfaces, that receive packets they've just sent.  Fixes bug 5121. OK deraadt@, mcbride@
Add a duplicate check for our own advertisements.  This is necessary
for dumb non simplex interfaces, that receive packets they've just
sent.  Fixes bug 5121.
OK deraadt@, mcbride@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars