[Bf-cycles] AMD OpenCL status

Hi all, Just a quick update to show we're making some progress here. We got a new OpenCL runtime to test from AMD (with fixes which will presumably be in the next driver release), and for the first time we now got shading nodes and textures working, which puts this at feature parity with GTX 2xx cards using CUDA. The main issue with this still is that compiling uses a lot of memory (about 6GB when I tested). It's possible to build these in advance and bundle them as we do for CUDA, so we'll look into getting that set up. Brecht.