Intel's Iris Gallium3D Driver Now Has Better OpenGL Compatibility Profile Support

Intel's modern "Iris" Gallium3D driver has exposed GLSL 4.60 compatibility (the shading language requirements for OpenGL 4.6) but when creating an OpenGL compatibility context it's been at 1.40 for the old OpenGL 3.1 requirements. Fortunately, the compatibility mode now too exposes 4.60 support...