Hmm...  Looks like a unified diff to me...
The text leading up to this was:
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|Author: Jan Christoph Ebersbach <jceb@e-jc.de>
|URL: http://dwm.suckless.org/patches/single_tagset
|This patch addresses the multi-monitor setup. Instead of having separate tags
|for every monitor there is just one list of tags for all monitors. Instead of
|moving windows from one monitor to the other, the desired tag from the
|other monitor can just be selected and all windows will be drawn on the
|current monitor.
|
|Several deep changes needed to be made:
|1. Macro ISVISIBLE expects a second parameter, the monitor
|2. Monitor->clients and Monitor->stack were moved to the global variable
|   Clientlist cl. All monitors refer to this one list.
|3. A new method attachclients was added. When changing between tags this
|   function ensures that all clients are pointing to the right monitor.
|
|Please be aware that this patch probably breaks any other patch!
|
|diff -r ec4baab78314 dwm.c
|--- a/dwm.c	Mon Dec 19 15:38:30 2011 +0100
|+++ b/dwm.c	Fri Apr 06 08:23:13 2012 +0200
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Patching file dwm.c using Plan A...
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done