Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up dwm-6.2/config.def.h dwm-6.2-azerty/config.def.h
|--- dwm-6.2/config.def.h	Sat Feb  2 13:55:28 2019
|+++ dwm-6.2-azerty/config.def.h	Sat Apr 24 22:28:13 2021
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 78.
Hmm...  Ignoring the trailing garbage.
done