From: Michael R. Crusoe <crusoe@debian.org>
Subject: Cython, silence warnings about the language_level
--- azure-uamqp-python.orig/setup.py
+++ azure-uamqp-python/setup.py
@@ -248,7 +248,7 @@
     history = f.read()
 
 if USE_CYTHON:
-    extensions = cythonize(extensions)
+    extensions = cythonize(extensions, language_level = "3str")
 
 setup(
     name='uamqp',
