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Add CMake feature test for lambdas in unevaluated context

Santiago Ospina De Los Ríos requested to merge feature/test-unevaluated-context-lambda into master

In order to use C++20 concepts in the CI, we need to check if the compiler is able to declare lambdas in unevaluated contexts. Since there is no feature macro for it even in c++20, this MR adds a CMake check that gives us this information in the config.h header. See dune-grid!377 (comment 90349)

Edited by Santiago Ospina De Los Ríos

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