cmake _HAVE_IOCTL examples

HDFGroup/hdf5 config/ConfigureChecks.cmake :401 

CHECK_FUNCTION_EXISTS (ioctl             ${HDF_PREFIX}_HAVE_IOCTL)

InsightSoftwareConsortium/ITK Modules/ThirdParty/HDF5/src/itkhdf5/config/cmake/ConfigureChecks.cmake :390 

CHECK_FUNCTION_EXISTS (ioctl             ${HDF_PREFIX}_HAVE_IOCTL)

Tencent/Forward source/third_party/hdf5/config/cmake_ext_mod/ConfigureChecks.cmake :467 

CHECK_FUNCTION_EXISTS (ioctl             ${HDF_PREFIX}_HAVE_IOCTL)

Kitware/VTK ThirdParty/hdf5/vtkhdf5/config/cmake_ext_mod/ConfigureChecks.cmake :416 

CHECK_FUNCTION_EXISTS (ioctl             ${HDF_PREFIX}_HAVE_IOCTL)