remove unnecessary whitespace

Change-Id: I0dda7886718b0e3ff81a0d6d43cca2887877ea9d
make something visible on the screen again

Why do we still use a double buffered FBC? It apparently works in the
feature/opengl-vcl branch.

Change-Id: I48b6879b9a9f7fec67f4da25cade46a32d8ad6fa
use the OpenGLHelper version to check for OpenGL support

Change-Id: Ib101d2605e5e739bb1d063fa7019e4e5930462a0
Revert "make something visible on the screen again"

This reverts commit 6661fdab95b981843f6d8392769f32e7377eaaeb.
use correct flag to enable ARB debug version

Change-Id: I933aea4f9cb1ccd58f9a07e7d32ff28077f8bb33
remove some useless SAL_WARNs

Change-Id: I26ae7aaab0e2d1685fd9c961aba027e1399b6911