driCreateContextAttribs() emits an error if bit
__DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS is set for an ES context. But,
EGL_EXT_create_context_robustness and EGL 1.5 both allow creation of
robust ES contexts. One requests a robust ES context by setting the
EGL_CONTEXT_OPENGL_ROBUST_ACCESS *attribute*, which Mesa's EGL layer
translates into the __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS *bit*.
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
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