Merge branch 'cleanup/remove-openmp-dependency' into 'master'

Timo Kochrequested to merge
cherry-pick-d99ffe88 into releases/3.2

[cleanup] Remove OpenMP dependency after upstream fix in opm-common/release/2020.04

See merge request !2102 (merged)

(cherry picked from commit d99ffe88)

32b3d59f [cleanup] Remove OpenMP dependency after upstream fix in opm-common/release/2020.04

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