cmake _HAVE_GETHOSTNAME examples

HDFGroup/hdf5 config/ConfigureChecks.cmake :427 

CHECK_FUNCTION_EXISTS (gethostname       ${HDF_PREFIX}_HAVE_GETHOSTNAME)

InsightSoftwareConsortium/ITK Modules/ThirdParty/HDF5/src/itkhdf5/config/cmake/ConfigureChecks.cmake :411 

CHECK_FUNCTION_EXISTS (gethostname       ${HDF_PREFIX}_HAVE_GETHOSTNAME)

Tencent/Forward source/third_party/hdf5/config/cmake_ext_mod/ConfigureChecks.cmake :497 

CHECK_FUNCTION_EXISTS (gethostname       ${HDF_PREFIX}_HAVE_GETHOSTNAME)

Kitware/VTK ThirdParty/hdf5/vtkhdf5/config/cmake_ext_mod/ConfigureChecks.cmake :444 

CHECK_FUNCTION_EXISTS (gethostname       ${HDF_PREFIX}_HAVE_GETHOSTNAME)