Request EGL_DONT_CARE version instead of 0 on GL NULL configs.
Request EGL_DONT_CARE version instead of 0 on GL NULL configs.

This caused the backends to fail native context creation and skip tests
on these configs.

BUG=angleproject:2464

Change-Id: I04922853a33c4bd8b38c87145f65431d8eb3db10
Reviewed-on: https://chromium-review.googlesource.com/1054482
Reviewed-by: Yuly Novikov <36f5580f63d0a3eacc17e89a61d11e2f646630d2@chromium.org>
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Commit-Queue: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle