Comment # 8 on bug 59322 from Marek Olšák

I have found the problem. Wine is trying to use the GL_SRGB8_ALPHA8 format,
which is not supported for rendering by the driver internally, but I agree the
format should be allowed in the API. The fix is on the way.

Is it a big deal that ARB_framebuffer_sRGB is unsupported? In such a case, the
renderbuffer format GL_SRGB8_ALPHA8 is equivalent to GL_RGBA8.