Disable some OpenGL 4.5 functions until AMD fixes their trash driver.

[Sonicadvance1]

[delroth]

I don't really like this (I think we should fallback to 4.4, not 2.0), but let's fix the breakage for now.

[Nucleoprotein]

I don't think they (AMD) care, because of today's Vulkan 1.0 "premiere". Vulkan was designed from their Mantle API so I think they will be fully going into it.
Drivers are available for AMD (Windows only - http://support.amd.com/en-us/kb-articles/Pages/radeon-vulkan-beta.aspx ) and Nvidia (Windows / Linux - https://developer.nvidia.com/vulkan-driver ), Intel driver will be soon available.
Maybe time to start writing Vulkan renderer as it will be supported on mobile devices too in future.

[MayImilae]

Note that this error that this fixed also occurred on working GPUs with older drivers that didn't support OpenGL 4.5 yet. It happened to me!

[delroth]

@Tapcio please keep the off-topic wishful thinking for our forums please.

[Nucleoprotein]

I checked AMD OpenGL driver (64bit one, atio6axx.dll) for those strings, and there are in the driver binary but with ARB extension (even in old 15.7.1). I think AMD implement those function only with GL_ARB_robustness.