CC-5133: Make sure Liquidsoap 1.1.1 is used

add missing file

python_apps/pypo/pure.py

@@ -0,0 +1,7 @@
+import re
+
+
+def version_cmp(version1, version2):
+    def normalize(v):
+        return [int(x) for x in re.sub(r'(\.0+)*$','', v).split(".")]
+    return cmp(normalize(version1), normalize(version2))