[bug#33012] [PATCH 3/3] ui: Fix port-buffering with address@hidden

[Ludovic Courtès]

address@hidden skribis:

> From: Eric Bavier <address@hidden>
>
> * guix/status.scm (build-event-output-port)address@hidden: Do not call 
> 'setvbuf'
> on custom binary port.
> * tests/status.scm (current-build-output-port, UTF-8 + garbage)address@hidden:
> Use "?" in place of REPLACEMENT CHARACTER.

LGTM, thanks!

Ludo'.