Fix build error on MacOS due to sed command usage
Fix build error on MacOS due to sed command usage

Non GNU sed on macOS expects suffix after -i option (can be empty str).
However, removing the comments from the pyside generated files is not a necessary
operation (presumably done to avoid a diff when no code changed), so simply skip the operation on macOS

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