Fix subtle dependency problem with tevc and libevent.a, building tevc is apparently what triggers libevent.a to be built in the ../lib directory.
Fix subtle dependency problem with tevc and libevent.a, building tevc
is apparently what triggers libevent.a to be built in the ../lib
directory.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome