Don't lock the CPU

src/hydra-queue-runner/hydra-queue-runner.cc

@@ -1244,6 +1244,7 @@ int main(int argc, char * * argv)
 
         settings.buildVerbosity = lvlVomit;
         settings.useSubstitutes = false;
+        settings.lockCPU = false;
 
         /* FIXME: need some locking to prevent multiple instances of
            hydra-queue-runner. */