Do not restart close if errno is EINTR

In java.base/linux/native/libnet/linux_close.c:

        do {
            if (fd1 < 0) {
                rv = close(fd2);
            } else {
                rv = dup2(fd1, fd2);
            }
        } while (rv == -1 && errno == EINTR);

However, the close() call is not restartable.
Only dup2() needs to be restarted if interrupted.