doc: fix compile error on "shoddy" example extension (GH-216)

(cherry picked from commit fb8fe72fc593438f6a0b934c6ff2d9c4aa28673d)
diff --git a/Doc/includes/setup.py b/Doc/includes/setup.py
index b853d23..a38a39d 100644
--- a/Doc/includes/setup.py
+++ b/Doc/includes/setup.py
@@ -5,4 +5,5 @@
          Extension("noddy2", ["noddy2.c"]),
          Extension("noddy3", ["noddy3.c"]),
          Extension("noddy4", ["noddy4.c"]),
+         Extension("shoddy", ["shoddy.c"]),
          ])