PostProcessing: Ensure shader is applied when we switch to Anaglyph mode.
OGL: Remove Virtual XFB SBS support.
ProgramShaderCache: Abort shader compilation if geometry shader failed to compile.
TextureCache: Recompile EFB2Tex shaders when stereo 3D is toggled.
GeometryShader: Adjust positions after projection.

This change assumes the fustrum is symmetric, i.e. Projection 2 = 0.