cmake HAVE_FOPEN64 examples

simongog/sdsl libdivsufsort-2.0.1/CMakeModules/CheckLFS.cmake :55 

check_symbol_exists("fopen64" "stdio.h" HAVE_FOPEN64)

simongog/sdsl libdivsufsort-2.0.1/CMakeModules/CheckLFS.cmake :77 

endif(HAVE_FOPEN64 AND HAVE_FSEEKO64 AND HAVE_FTELLO64)