FindGaudi.cmake Update, master branch (2021.05.17.)

Attila Krasznahorkayrequested to merge
akraszna/atlasexternals:FindGaudiUpdate-master-20210517 into master

Made FindGaudi.cmake functional with the latest version of Gaudi master, fixing the issue described in gaudi/Gaudi#180 (closed).

In a recent change (gaudi/Gaudi!1209 (merged)) Gaudi switched to preferring to use the TBBConfig.cmake file shipped with the LCG TBB installation. Setting TBB_ROOT explicitly in FindGaudi.cmake makes sure that GaudiConfig.cmake would find TBB successfully.

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