ignore ENOTSUPP (524) for fiemap error

In mfu_flist_copy.c:mfu_copy_file_fiemap()

    if (ioctl(mfu_src_file->fd, FS_IOC_FIEMAP, fiemap) < 0) {
        if (errno == ENOTSUP) {
            /* silently ignore */
        } else {
            MFU_LOG(MFU_LOG_ERR, "fiemap ioctl() failed for src '%s' (errno=%d %s)",
                    src, errno, strerror(errno));
        }
        goto fail_fiemap;
    }

When errno is ENOTSUP (95) the error message is skipped, but otherwise the behavior is the same. However lustre often returns ENOTSUPP (524) as mentioned in #545. I think that (errno == 524) should be silently ignored as well.

Open mfu_flist_copy.c and inspect mfu_copy_file_fiemap(), especially the errno check around the FS_IOC_FIEMAP ioctl. Confirm the intended behavior against the existing issue context for Lustre, then verify that ENOTSUPP is treated like ENOTSUP without changing other fiemap errors.