ensure that a failing return code propagates out from linux travis-build-main
ensure that a failing return code propagates out from linux travis-build-main

curieos/Slic3r,pieis2pi/Slic3r,curieos/Slic3r,curieos/Slic3r,alexrj/Slic3r,curieos/Slic3r,alexrj/Slic3r,pieis2pi/Slic3r,pieis2pi/Slic3r,alexrj/Slic3r,alexrj/Slic3r,curieos/Slic3r,pieis2pi/Slic3r,alexrj/Slic3r,alexrj/Slic3r,pieis2pi/Slic3r,curieos/Slic3r,pieis2pi/Slic3r