d00f eb51128ec7 stp: a port without carrier does not become the root port ...

stp_reselect() took every port with fresh information as a candidate, so a
BPDU credited to a port whose carrier the once-a-second link poll had not
seen yet made that port the root port before the port was set up for it.
A candidate now needs its link bit as well; the poll that sees the carrier
a moment later runs the selection again. Scenario 54.

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..

Makefile

test/stp: build the simulator against the firmware headers

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stp_sim.c

stp: a port without carrier does not become the root port

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