Feature/fs 1538 build and mark skipped tests

The remaining conditional builds are kept because they are used to build tests multiple times, with or without SuperLU, ARPACKPP or UPFPack.

dune/istl/eigenvalue/test/CMakeLists.txt

@@ -7,14 +7,14 @@ if(SUPERLU_FOUND)
add_dune_superlu_flags(poweriterationsuperlutest)
dune_add_test(TARGET poweriterationsuperlutest)
target_link_libraries(poweriterationsuperlutest dunecommon)
-endif(SUPERLU_FOUND)
+endif()
if(ARPACKPP_FOUND)
add_executable(arpackpptest cond2test.cc)
add_dune_arpackpp_flags(arpackpptest)
target_link_libraries(arpackpptest dunecommon)
dune_add_test(TARGET arpackpptest)
-endif(ARPACKPP_FOUND)
+endif()
if(ARPACKPP_FOUND AND SUPERLU_FOUND)
dune_add_test(NAME arpackppsuperlutest