Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -wup a/dmenu.c b/dmenu.c
|--- a/dmenu.c	2017-06-12 00:35:39.814716857 +0200
|+++ b/dmenu.c	2017-06-11 23:59:18.794768196 +0200
--------------------------
Patching file dmenu.c using Plan A...
Hunk #1 succeeded at 36.
Hunk #2 succeeded at 131.
Hunk #3 succeeded at 143.
Hunk #4 succeeded at 487.
Hunk #5 succeeded at 647.
Hunk #6 succeeded at 670.
done