89e23c743e601940fc051189ef01c537233d2043

On Apple we use OpenGL 2.1 + an ARB extension for framebuffers. The glFramebufferTexture function is part of OpenGL 3.0 but not part of the ARB extension. This commit fills that gap. All other platforms are using GL 3.0+ already so it's not an issue there. All platforms (Mac too) will use GL 3.3+ soon so this workaround will be removed.
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