Merge branch 'feature/make-test-depend-on-target' into 'master'

Timo Kochrequested to merge
tkoch/dune-common:cherry-pick-27af4005 into releases/2.6

[cmake][dune_add_test] Set test property to depend on existence of target

Closes #100 (closed)

See merge request !404 (merged)

(cherry picked from commit 27af4005)

69efd0be [cmake][dune_add_test] Set test property to depend on existence of target

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