option(ITK_USE_SYSTEM_HDF5 "Use an outside build of HDF5." ${ITK_USE_SYSTEM_LIBRARIES})
mark_as_advanced(ITK_USE_SYSTEM_HDF5)
if(ITK_USE_SYSTEM_HDF5)
  if(BUILD_SHARED_LIBS)
    find_package(HDF5 NO_MODULE COMPONENTS CXX C shared)
  else()
    find_package(HDF5 NO_MODULE COMPONENTS CXX C static)
  endif()

  if(NOT HDF5_FOUND)
    find_package(HDF5 REQUIRED COMPONENTS CXX C)
  endif()
endif()

option(ITK_USE_SYSTEM_HDF5 "Use an outside build of HDF5." ${ITK_USE_SYSTEM_LIBRARIES})
mark_as_advanced(ITK_USE_SYSTEM_HDF5)
if(ITK_USE_SYSTEM_HDF5)
  if(BUILD_SHARED_LIBS)
    find_package(HDF5 QUIET NO_MODULE COMPONENTS CXX C shared)
  else()
    find_package(HDF5 QUIET NO_MODULE COMPONENTS CXX C static)
  endif()

  if(NOT HDF5_FOUND)
    find_package(HDF5 REQUIRED COMPONENTS CXX C)
  endif()
endif()

Make initial HDF5 discovery of 1.8.16 quiet.
COMP: Make initial HDF5 discovery of 1.8.16 quiet.

Avoid the warning:

CMake Warning at Modules/ThirdParty/HDF5/itk-module-init.cmake:7 (find_package):
  Could not find a package configuration file provided by "HDF5" with any of
  the following names:

    HDF5Config.cmake
    hdf5-config.cmake

  Add the installation prefix of "HDF5" to CMAKE_PREFIX_PATH or set
  "HDF5_DIR" to a directory containing one of the above files.  If "HDF5"
  provides a separate development package or SDK, be sure it has been
  installed.

when HDF5 1.8.15 or lower is installed.

Change-Id: Ie7a5dac8da8d3e85c62cc01c8d5a8ed5f18f5d93
