Merge branch 'issue/backported-cmake-modules' into 'master'

Markus Blattrequested to merge
cherry-pick-da9f1859 into releases/2.8

Make search path for FindPkgConfig explicit in FindTBB

See merge request !1000 (merged)

(cherry picked from commit da9f1859)

34c28fda Make search path for FindPkgConfig explicit in FindTBB

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