[Haskell] ANNOUNCE: OpenGL 2.3.0.0

A new version of the OpenGL package has bee uploaded to Hackage. The main change is that it is now only a convenience layer upon the OpenGLRaw and GLURaw packages, written in in pure Haskell without the FFI. The latter two packages load the native libraries dynamically and do not rely on any C headers, making it possible to build all OpenGL-related packages even on machines without any installed native OpenGL support. Apart from that, a bug in vertexAttribPointer has been fixed. Cheers, S.