X11: For multiple windows across different displays, don't share gl contexts.
X11: For multiple windows across different displays, don't share gl contexts.

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