In FindHDF5, added C library names to CXX search libraries.

Modules/FindHDF5.cmake

@@ -162,7 +162,7 @@ else()
     
     # seed the initial lists of libraries to find with items we know we need
     set( HDF5_C_LIBRARY_NAMES_INIT hdf5 hdf5_hl )
-    set( HDF5_CXX_LIBRARY_NAMES_INIT hdf5_cpp )
+    set( HDF5_CXX_LIBRARY_NAMES_INIT ${HDF5_C_LIBRARY_NAMES_INIT} hdf5_cpp )
     
     foreach( LANGUAGE ${HDF5_LANGUAGE_BINDINGS} )
         if( HDF5_${LANGUAGE}_COMPILE_LINE )