bug#43244: 28.0.50; Compilation warnings now look a bit odd

[Lars Ingebrigtsen]

For instance:

org/ol-gnus.el:271:1: Warning: the function ‘nnir-article-group’ is not known
    to be defined. Disable showing Disable logging

This is the result of a recent change that was meant to introduce some
new buttons in the *Warnings* buffer, but they apparently leak...


In GNU Emacs 28.0.50 (build 26, x86_64-pc-linux-gnu, GTK+ Version 3.24.22, 
cairo version 1.16.0)
 of 2020-09-06 built on xo
Repository revision: 6fc502c1ef327ab357c971b9bffbbd7cb6a436f1
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Debian GNU/Linux bullseye/sid

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(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no