cmake HAVE_FILE_LENGTH_I64 examples

Unidata/netcdf-c CMakeLists.txt :1331 

CHECK_FUNCTION_EXISTS(_filelengthi64 HAVE_FILE_LENGTH_I64)

Kitware/VTK ThirdParty/netcdf/vtknetcdf/CMakeLists.txt :190 

check_symbol_exists("_filelengthi64" "io.h" HAVE_FILE_LENGTH_I64)