hdf5_ep

[svn-r13536] Added source files to Windows C++ test project files.  Both testhdf5_cpp.dsp and testhdf5_cppdll.dsp received:
./c++/test/tcompound.cpp
./c++/test/ttypes.cpp
./c++/test/tfilter.cpp
./c++/test/tvlstr.cpp

Also, fixed a declaration in ttypes.cpp that was causing a compile error in MSVS6.0.

Tested:
Visual Studio 6.0 on WinXP
kagiso
too minor for h5committest