As we now encounter path issues on linux lets try shortpaths there too

ninja: error: WriteFile(_home_appimage_Craft_BinaryCache_linux-64-gcc_build_libs_qt5_qtwebengine_work_RelWithDebInfo-5.13.0_src_core_release_QtWebEngineCore_MOCjumbo_mergehome_appimage_Craft_BinaryCache_linux-64-gcc_build_libs_qt5_qtwebengine_work_RelWithDebInfo-5.13.0_src_toolchain_target__rule.rsp): Unable to create file. File name too long