message: fix compilation with glibc >= 2.26, use sys headers instead of rpc
diff: //#include <netinet/in.h>
  //#include <netinet/tcp.h>
  #include <unistd.h>
  -#ifndef __CYGWIN__
  -#include <rpc/types.h>
  -#endif
  +#include <sys/types.h>
  +#include <sys/time.h>
  #include <fcntl.h>
  #include <sys/stat.h>
  #include <netinet/in.h>
  