fix OpenGL canvas windows build

Change-Id: Ic6ed9c69003fa79a60310dc0b010ffc0ca868791
remove useless OGL transition shader code

Change-Id: I8930aab2b4d3fd00916f12b86fa06b5e011542ac
we always have GLX 1.3, even on the baseline

Change-Id: I381aca6e09a63d21bcbdf2625c4d829f84819bf8
make OGLTrans build on windows

We still need to fix a number of issues around pixmap to make it really useful.

Change-Id: I747d735d043d91d51809801edd9b778622b6063c
fix problems around shaders

Change-Id: I1577fb81cb3cf1fac3f5ba5d560d96cb83d4483d