Single-threaded build of ospray

Author: dcwhite

.github/workflows/ccpp.yml

@@ -90,4 +90,4 @@ jobs:
       run: sudo apt-get update && sudo apt-get install mesa-common-dev libgl1-mesa-dev mesa-utils-extra libglapi-mesa ninja-build qt5-qmake qtbase5-dev libqt5opengl5-dev libqt5svg5-dev
 
     - name: Build
-      run: ./build.sh -DQt5_PATH=$(dpkg -L qtbase5-dev) -DUSER_PYTHON_VERSION="3.6.7" -DWITH_OSPRAY:BOOL=ON -j3 
+      run: ./build.sh -DQt5_PATH=$(dpkg -L qtbase5-dev) -DUSER_PYTHON_VERSION="3.6.7" -DWITH_OSPRAY:BOOL=ON