cmake _HAVE_FABSF16 examples

HDFGroup/hdf5 config/ConfigureChecks.cmake :1099 

CHECK_FUNCTION_EXISTS (fabsf16 ${HDF_PREFIX}_HAVE_FABSF16)

InsightSoftwareConsortium/ITK Modules/ThirdParty/HDF5/src/itkhdf5/config/cmake/ConfigureChecks.cmake :992 

CHECK_FUNCTION_EXISTS (fabsf16 ${HDF_PREFIX}_HAVE_FABSF16)