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fix new gcc 8.1 warnings

#include <sys/ioctl.h>

int __libc_tcflush(int fd, int queue_selector);
int __libc_tcflush(int fd, int queue_selector)
{
  return ioctl(fd, TCFLSH, queue_selector);
}

int tcflush(int fd, int queue_selector) __attribute__((weak,alias("__libc_tcflush")));