Windows: QNetworkSession autotest fails

Windows: QNetworkSession autotest fails when ran with "nmake check" due to the assumptions it makes about current directory:

QDEBUG : tst_QNetworkSession::outOfProcessSession() 0 "Process failed to start: No such file or directory"
FAIL!  : tst_QNetworkSession::outOfProcessSession() 'lackey.waitForStarted()' returned FALSE. ()
.\tst_qnetworksession.cpp(921) : failure location

If run from qtbase\tests\auto\network\bearer\qnetworksession directory with command "release\tst_qnetworksession.exe", then it finds the lackey process and passes.