Tidy up experimental code for windowless mode in linux with a #define ENABLE_GTK_PBUFFER_RENDERING, disabled by default. https://tracker.physiomeproject.org/show_bug.cgi?id=921
Tidy up experimental code for windowless mode in linux with a #define ENABLE_GTK_PBUFFER_RENDERING,
disabled by default.
https://tracker.physiomeproject.org/show_bug.cgi?id=921

git-svn-id: 4705079bc6b8aadf675e3696f5c015a6aa4916e3@6099 3c1deb5b-d424-0410-962d-aba41a686d42

OpenCMISS/zinc,hsorby/zinc,OpenCMISS/zinc,hsorby/zinc,OpenCMISS/zinc,hsorby/zinc,hsorby/zinc,OpenCMISS/zinc