Pull TESTDIR out of the global includes if tests are being built.
Pull TESTDIR out of the global includes if tests are being built.

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