Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|Author: Mohammad Zeinali <mzeinali@tutanota.com>
|URL: http://dwm.suckless.org/patches/single_tagset
|A new update for single_tagset which is compatible with dwm 6.2.
|
|diff --git a/dwm.c b/dwm.c
|index 4465af1..179328e 100644
|--- a/dwm.c
|+++ b/dwm.c
--------------------------
Patching file dwm.c using Plan A...
Hunk #1 succeeded at 49.
Hunk #2 succeeded at 82.
Hunk #3 succeeded at 125.
Hunk #4 succeeded at 141.
Hunk #5 succeeded at 189.
Hunk #6 succeeded at 273.
Hunk #7 succeeded at 306.
Hunk #8 succeeded at 388.
Hunk #9 succeeded at 409.
Hunk #10 succeeded at 518.
Hunk #11 succeeded at 605.
Hunk #12 succeeded at 651.
Hunk #13 succeeded at 671.
Hunk #14 succeeded at 721.
Hunk #15 succeeded at 730.
Hunk #16 succeeded at 770.
Hunk #17 succeeded at 845.
Hunk #18 succeeded at 899.
Hunk #19 succeeded at 1168.
Hunk #20 succeeded at 1255.
Hunk #21 succeeded at 1421.
Hunk #22 succeeded at 1475.
Hunk #23 succeeded at 1600.
Hunk #24 succeeded at 1677.
Hunk #25 succeeded at 1717.
Hunk #26 succeeded at 1754.
Hunk #27 succeeded at 1762.
Hunk #28 succeeded at 1800.
Hunk #29 succeeded at 1820.
Hunk #30 succeeded at 1839.
Hunk #31 succeeded at 1937.
Hunk #32 succeeded at 1967.
Hunk #33 succeeded at 1990.
Hunk #34 succeeded at 2130.
Hunk #35 succeeded at 2164.
Hunk #36 succeeded at 2231.
done