[gPXE] Variable for 'current' nic?

[Jarrod Johnson]

If gPXE instance sees, for example, net0 and net1, putting ${mac} on the
imgarg always does ${net0/mac}, even if net1 was the device that
successfully started the boot process.  Is there a strategy to get the mac
address for whichever nic successfully boots if you don't know which one it
will be in advance?
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