cmake _FORTRAN_HAVE_SIZEOF examples

HDFGroup/hdf5 config/HDFUseFortran.cmake :74

check_fortran_source_compiles (${SOURCE_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_SIZEOF SRC_EXT f90)

InsightSoftwareConsortium/ITK Modules/ThirdParty/HDF5/src/itkhdf5/config/cmake/HDFUseFortran.cmake :58

check_fortran_source_compiles (${SOURCE_CODE} ${HDF_PREFIX}_FORTRAN_HAVE_SIZEOF SRC_EXT f90)