Really disable the tests here

CI/ci-mac.sh

@@ -90,6 +90,8 @@ echo "======================================================================"
 echo -e "${NC}"
 
 
+if [ "$LANGUAGE" == "C++11" ]; then
+
   # Execute Python unittests
   cd Python-Unittests
 
@@ -98,6 +100,12 @@ cp ../Build/python/openmesh.so .
   python -m unittest discover -v
 
   cd ..
+
+else
+  echo "WARNING! Python unittests disabled for clang on Mac with c++98 !!"
+fi
+
+
 cd ..