xwayland/eglstream: Log when GL_OES_EGL_image is missing

That will dramatically affect performance, might as well log when we
cannot use GL_OES_EGL_image with the NVIDIA closed-source driver.

Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
5 jobs for xwayland-eglstream-glvnd in 20 minutes and 54 seconds (queued for 14 seconds)
Status Job ID Name Coverage
  Docker Image
passed #10271668
debian-buster

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  Build And Test
passed #10271669
autotools

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passed #10271670
meson

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passed #10271671
meson-noglamor

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passed #10271672
mingw-cross-build

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