[PATCH 1 of 3 STABLE] py3: use mail.parsebytes() in gnuarch catlog parser

[Yuya Nishihara]

On Mon, 04 Nov 2019 10:18:44 +0100, Denis Laxalde wrote:
> # HG changeset patch
> # User Denis Laxalde <denis at laxalde.org>
> # Date 1572857533 -3600
> #      Mon Nov 04 09:52:13 2019 +0100
> # Branch stable
> # Node ID b09e0c3c51f1d819eaaec188a5c9e26219294586
> # Parent  579672b347d2169a4abfb372873972a0fd6a839c
> py3: use mail.parsebytes() in gnuarch catlog parser

Queued for stable, many thanks.