Partially disabled glibc ioctls causing FTBFS error(s)

[Guillem Jover <guillem@debian.org>]

Hi!

I just noticed the inetutils build failure on the Hurd, and tracking
it down found:

  <https://salsa.debian.org/glibc-team/glibc/blob/sid/debian/patches/hurd-i386/local-no_unsupported_ioctls.diff>

While I've prepared a patch to fix this, I think it might be better
(instead or in addition) to disable the ioctls and the matching ioctl
options.

For example in inetutils, the code works on GNU/Linux because it's
checking whether LNOFLSH is defined, and if so then it uses TIOCLGET.

Thanks,
Guillem