glut: explicitly destroy glut window when PangolinGl context is destroyed.
glut: explicitly destroy glut window when PangolinGl context is destroyed.

renzodenardi/Pangolin,randi120/Pangolin,visigoth/Pangolin,randi120/Pangolin,wxdzju/Pangolin,stevenlovegrove/Pangolin,tschmidt23/Pangolin,wxdzju/Pangolin,arpg/Pangolin,mp3guy/Pangolin,stevenlovegrove/Pangolin,tschmidt23/Pangolin,mp3guy/Pangolin,renzodenardi/Pangolin,mp3guy/Pangolin,stevenlovegrove/Pangolin,visigoth/Pangolin,tschmidt23/Pangolin,arpg/Pangolin