[PATCH 3/3] aarch64: Move ld.so _start to separate file

[Florian Weimer]

* Szabolcs Nagy via Libc-alpha:

> A separate asm file is easier to maintain than a macro that expands to
> inline asm.
>
> The RTLD_START macro is only needed now becase _dl_start is local in

typo: beca[u]se

> rtld.c, but _start has to call it, if _dl_start was made hidden then
> it could be empty.

The commit message should mention the _dl_skip_args removal.  Or that
could be done in the previous patch.

Thanks,
Florian