catkin libraries are linked for test_diagnostic_aggregator target

Otherwise there are link errors for class_loader on Mac OS X.

    Undefined symbols for architecture x86_64:
    "class_loader::class_loader_private::AbstractMetaObjectBase:: addOwningClassLoader(class_loader::ClassLoader*)", referenced from:
      void class_loader::class_loader_private::registerPlugin<test_diagnostic_aggregator::MatchNoAnalyzeAnalyzer, diagnostic_aggregator::Analyzer>(std::string const&, std::string const&) in match_no_analyze_analyzer.cpp.o