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Fixes clang warning about friend decl using struct instead of class.

Timo Koch requested to merge fix/compiler-warning-backport-2.7 into releases/2.7 
dune/istl/schwarz.hh:280:12: warning: struct 'ConstructionTraits' was previously declared as a class [-Wmismatched-tags]
    friend struct Amg::ConstructionTraits<BlockPreconditioner<X,Y,C,P> >;
            ^

(cherry picked from commit 0385deac)

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