fixes #0003538: MacOSX 10.13 not in the 'About FreeCAD' dialog
fixes #0003538: MacOSX 10.13 not in the 'About FreeCAD' dialog

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master