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Workaround for ROOT issue

Marco Clemencic requested to merge clemenci-master-patch-66318 into master

ROOT master (6.28 candidate) prints a warning about the DISPLAY environment variable not being set (see gaudi/Gaudi#243).

Setting DISPLAY to an empty string is enough to hide the warning while waiting for the fix in ROOT.

I'm also setting FONTCONFIG_PATH as it is needed in my local tests to avoid other error messages.

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