Fixes for LLVM port.

include/elm/data/ArrayList.h

include/elm/data/Bag.h

include/elm/data/SortedList.h

include/elm/io/Output.h

include/elm/rtti/Class.h

include/elm/serial2/serial.h

include/elm/sys/Plugin.h

src/util_ErrorHandler.cpp

test/CMakeLists.txt

test/check-concept.h

test/test_alloc.cpp

test/test_hashtable.cpp

test/test_list.cpp

test/test_tree_bag.cpp

test/test_vector.cpp