[PATCH v3 11/32] elf: Merge the three implementations of _dl_dst_substitute

[Florian Weimer]

* Joseph Myers:

> On Thu, 7 Dec 2023, Florian Weimer wrote:
>
>> Use one implementation to perform the copying and the counting.
>> 
>> The IS_RTLD check for l_origin processing is eliminated because
>> $ORIGIN cannot used with the ld.so link map (and not with the
>> vDSO link map either) because there is no user code associated
>> with it that might call dlopen with an $ORIGIN path.
>
> OK, together with the removal of dl-dst.h and of its inclusion in 
> elf/dl-origin.c if that's what's intended.

Yes, this change will be part of the reposted version.  (This commit
depends on the not-yet-approved <alloc_buffer.h> changes.)

Thanks,
Florian