We started doing this in:
Author: Tapani Pälli <email@example.com>
Date: Mon Sep 26 10:03:32 2016 +0300
egl: stop claiming support for pbuffer + msaa
This fixes a crash in egl-create-msaa-pbuffer-surface Piglit test
and same crash in many dEQP EGL tests.
Whatever bug that was papering over appears to be fixed by now, I can no longer reproduce that crash with piglit. Furthermore, disabling that bit in the generic dri2 code had the side effect that the surfaceless platform would advertise EGLConfigs with no supported surface types (since surfaceless only supports pbuffers).