[Release][Bugfix] Fix __cxa_demangle() on recent clang
The test for __cxa_demangle(), which is used by Dune::className() to demangle type names, doesn't work on my clang 3.6. Apparently, clang requires the user to include <typeinfo> before <cxxabi.h>. While classname.hh already does this, the build system tests don't, causing the feature to get disabled on clang. Fixed by adding the include to the build system tests.
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