Move netcdf_cxx option to the advanced option set.

The netcdfcxx option isn't important or modified often enough to
warrant top billing.

Also make a note that vtk's findhdf4 is unimportant so no dev wastes
time on it in the future.

Change-Id: I0cb6dc08530a9ba87c613fd56c81ce95cdfb7aba

CMake/FindHDF5.cmake

 #
 # Find the native HDF5 includes and library
+# Note: this is deprecated, and will be removed entirely
+# once vtk's min cmake >= 2.8.0
 #
 # HDF5_INCLUDE_DIR - where to find H5public.h, etc.
 # HDF5_LIBRARIES   - List of fully qualified libraries to link against when using hdf5.

Utilities/vtknetcdf/CMakeLists.txt

@@ -225,6 +225,7 @@ TEST_BIG_ENDIAN(CMAKE_WORDS_BIGENDIAN)
 SET(WORDS_BIGENDIAN ${CMAKE_WORDS_BIGENDIAN})
 
 OPTION(NETCDF_ENABLE_CXX "Build netcdf C++ API" ON)
+mark_as_advanced(NETCDF_ENABLE_CXX)
 SET(CXX NETCDF_ENABLE_CXX)
 
 OPTION(NETCDF_ENABLE_NETCDF4 "Build netcdf version 4 API" ON)