Merge branch 'cherry-pick-2aed6a28' into 'releases/2.5'

Merge branch 'feature/reenable-solvertest' into 'master'

reenable solvertest

... got 'lost' in the cmake transition

See merge request !75

See merge request !76

dune/istl/test/CMakeLists.txt

@@ -45,6 +45,8 @@ dune_add_test(SOURCES inverseoperator2prectest.cc)
 
 dune_add_test(SOURCES scaledidmatrixtest.cc)
 
+dune_add_test(SOURCES solvertest.cc)
+
 dune_add_test(SOURCES solveraborttest.cc)
 
 # Pardiso tests