Pool section entries for DWP version 1

[Fangrui Song]

On 2022-11-10, Cary Coutant via Binutils wrote:
>> Does anyone still have dwp version 1 files they can use to test my
>> change?
>
>I doubt version 1 was ever used outside of Google, and it probably
>hasn't been in use for at least 6 years. We could probably just remove
>the support for it.
>
>-cary

I agree.


It would be nice to support DWARF v5 in dwp.  .debug_loclists,
.debug_rnglists, .debug_macro are not supported.