cmake FORTRAN_HAVE_C_LONG_DOUBLE examples

HDFGroup/hdf5 config/HDF5UseFortran.cmake :98

check_fortran_source_compiles (${SOURCE_CODE} FORTRAN_HAVE_C_LONG_DOUBLE SRC_EXT f90)

InsightSoftwareConsortium/ITK Modules/ThirdParty/HDF5/src/itkhdf5/config/cmake/HDF5UseFortran.cmake :80

check_fortran_source_compiles (${SOURCE_CODE} FORTRAN_HAVE_C_LONG_DOUBLE SRC_EXT f90)

Tencent/Forward source/third_party/hdf5/config/cmake/HDF5UseFortran.cmake :82

check_fortran_source_compiles (${SOURCE_CODE} FORTRAN_HAVE_C_LONG_DOUBLE SRC_EXT f90)