opencsg: Fix build related to missing libX11 linking the example. #13957
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See https://hydra.nixos.org/build/32684629 (when Hydra starts working again).
I have only seen this happening on release-16.03 not on master. So please merge at least to release-16.03 (yes this PR is against master). I don't completely understand the error but it looks like some logic for the linking might have changed, or dependencies of libraries have changed to cause this.