Work around deprecation of platform.dist() in recent python

Author: g1itch

setup.py

@@ -94,11 +94,14 @@ def run(self):
             ['desktop/icons/24x24/pybitmessage.png'])
     ]
 
-    if platform.dist()[0] in ('Debian', 'Ubuntu'):
-        data_files += [
-            ("etc/apparmor.d/",
-                ['packages/apparmor/pybitmessage'])
-        ]
+    try:
+        if platform.dist()[0] in ('Debian', 'Ubuntu'):
+            data_files += [
+                ("etc/apparmor.d/",
+                    ['packages/apparmor/pybitmessage'])
+            ]
+    except AttributeError:
+        pass  # FIXME: use distro for more recent python
 
     dist = setup(
         name='pybitmessage',