Remove __ASSUME_STATFS_F_FLAGS

[Florian Weimer]

On 05/10/2017 07:50 PM, Joseph Myers wrote:
> -#ifndef __ASSUME_STATFS_F_FLAGS
> -  if ((fsbuf->f_flags & ST_VALID) == 0)
> -    /* Determining the flags is tricky.  We have to read /proc/mounts or
> -       the /etc/mtab file and search for the entry which matches the given
> -       file.  The way we can test for matching filesystem is using the
> -       device number.  */
> -    buf->f_flag = __statvfs_getflags (name, fsbuf->f_type, fd);
> -  else
> -#endif
> -    buf->f_flag = fsbuf->f_flags ^ ST_VALID;
> +  buf->f_flag = fsbuf->f_flags ^ ST_VALID;

Should we check the presence of the flag and return ENOSYS or abort if 
it missing?

Thanks,
Florian