[PATCH roland/off64_t] clean up wordsize-64 off_t functions

[Roland McGrath]

> How is this definition *used* by installed headers?  

Oh, it's not at all.  Good point.

> If installed headers don't use it (only define it), it could be
> conditioned on _LIBC so it's clear it's not a public interface.  

We don't do that for other cases like _DIRENT_HAVE_*, so I don't
see a reason to do it here.

> It appears __LP64__ has been defined (if long and pointers are 64-bit and
> int is 32-bit) since at least GCC 3.4.

Good to know.  I'll use that in bits/typesizes.h and that should cover
ia64 and powerpc64 just fine.


Thanks,
Roland