Bug 896: Refine criteria to allow OpenGL API usage for EGL

It has been experienced w/ Mesa 10.3.2 (EGL 1.4/Gallium)
that even though initial OpenGL context can be created w/o 'EGL_KHR_create_context',
switching the API via 'eglBindAPI(EGL_OpenGL_API)' the latter 'eglCreateContext(..)' fails w/ EGL_BAD_ACCESS.

Hence we require both: OpenGL API support _and_  'EGL_KHR_create_context'.

FIXME: Evaluate this issue in more detail!

FIXME: Utilization of eglBindAPI(..) must be re-evaluated in case we mix ES w/ OpenGL, see EGL 1.4 spec.
       This is due to new semantics, i.e. API is bound on a per thread base,
	   hence it must be switched before makeCurrent w/ different APIs, see:
          eglWaitClient();

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