Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up dwm-5.8.2/config.def.h dwm-5.8.2-swap/config.def.h
|--- dwm-5.8.2/config.def.h	2010-06-04 13:39:15.000000000 +0300
|+++ dwm-5.8.2-swap/config.def.h	2011-01-26 07:53:44.607195598 +0200
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 53.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|Only in dwm-5.8.2-swap: config.h
|diff -up dwm-5.8.2/dwm.c dwm-5.8.2-swap/dwm.c
|--- dwm-5.8.2/dwm.c	2010-06-04 13:39:15.000000000 +0300
|+++ dwm-5.8.2-swap/dwm.c	2011-01-26 07:54:27.741193905 +0200
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 183.
Hunk #2 succeeded at 245.
Hunk #3 succeeded at 864.
Hunk #4 succeeded at 890.
done