remove the no longer bundled adafruit module from setup.py

setup.py

@@ -19,9 +19,8 @@ setup(
                       " the current time on a 7 segment display from Adafruit "
                       "attached via i2c"),
     license="3-clause BSD license",
-    packages=["adafruit_7segment", "stddlib"],
+    packages=["stddlib"],
     scripts=["stdd"],
     data_files=[('/etc', ['config/stdd.json']),
-                ('/etc/default', ['default/stdd'])],
-    requires=['prctl']
+                ('/etc/default', ['default/stdd'])]
 )