QEglPlatformContext: Also check for GL_EXT_ROBUSTNESS

EGL_EXT_create_context_robustness says that on GLES GL_EXT_robustness
is required - indeed the nvidia driver only exposes the EXT variant
on GLES. Without this a context with reset notification is created
but it's not reported via its format, this has impact when further
contexts sharing with it are created which need to match its robustness.

Pick-to: 6.11 6.10
Change-Id: I4d78a885777e8318d4a029849af4e6ad15de402f
Reviewed-by: Vlad Zahorodnii <[email protected]>
Reviewed-by: Laszlo Agocs <[email protected]>

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