Native bindings to the KHR_create_context extension.

With the advent of new versions of OpenGL which deprecate features and/or break backward compatibility with older versions, there is a need and desire to indicate at context creation which interface will be used. This extension adds a new context creation routine with attributes specifying the OpenGL version, context properties, and profile requested for the context. It also allows making an OpenGL 3.0 or later context (or other client API context supporting the ability) current without providing a default framebuffer. The new context creation attributes are also defined to work for OpenGL ES context creation when that makes sense, and the extension has been augmented to allow configs to advertise support for creating OpenGL ES 3.0 contexts.

Requires EGL 1.4.