test: make regression tests run on vxWorks, too

test/validate/Makefile

test/validate/array.st

test/validate/assign.st

test/validate/bittypes.st

test/validate/change.st

test/validate/decl.st

test/validate/evflag.db

test/validate/evflag.st

test/validate/local.st

test/validate/norace.st

test/validate/pvGet.st

test/validate/pvPutAsync.st

test/validate/pvSync.st

test/validate/race.st

test/validate/raceCommon.st

test/validate/safeMonitor.st

test/validate/sncDelay.st

test/validate/sncEntry.st

test/validate/sncEntryOpte.st

test/validate/sncEntryVar.st