d_off field in struct dirent and 32-on-64 emulation

[Florian Weimer]

* Adhemerval Zanella:

> My point is why still use non-LFS interfaces as default for new 32 bits ports
> when kernel has moved on a long time ago. From glibc standpoint tt requires 
> support two entrypoints with different semantic for the same  function which
> in the end will use the same syscall (besides the inherent issue with non-LFS 
> support).

We could perhaps announce in the glibc 2.29 NEWS file that a future
release of glibc will switch the default to LFS, with a plan for the
future to eliminate non-LFS interfaces completely (from the programming
interface).

Thanks,
Florian