port changes from Gaudi Merge Request 166
This PR allows building of Gaudi with local externals and solves GAUDI-1211. It also contains fixes for GAUDI-1212 which leads to fatal exception when pool size is -1 in ThreadPoolSvc.
This PR allows building of Gaudi with local externals and solves GAUDI-1211. It also contains fixes for GAUDI-1212 which leads to fatal exception when pool size is -1 in ThreadPoolSvc.