Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up a/config.def.h b/config.def.h
|--- a/config.def.h	2019-06-05 02:24:05.503321320 +0200
|+++ b/config.def.h	2019-06-05 10:46:48.099997829 +0200
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 41.
Hunk #2 succeeded at 78 (offset -3 lines).
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|Only in a: config.def.h.orig
|Only in b: dwm-bottomstack-20160719-56a31dc.diff
|diff -up a/dwm.c b/dwm.c
|--- a/dwm.c	2019-06-05 02:25:40.169986187 +0200
|+++ b/dwm.c	2019-06-05 10:48:42.443328992 +0200
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 233 (offset -2 lines).
No such line 2172 in input file, ignoring
Hunk #2 succeeded at 2151 (offset -26 lines).
done