fix troostwijk changes

env_OLD/Lib/site-packages/setuptools/py27compat.py

@@ -0,0 +1,18 @@
+"""
+Compatibility Support for Python 2.7 and earlier
+"""
+
+import sys
+
+
+def get_all_headers(message, key):
+    """
+    Given an HTTPMessage, return all headers matching a given key.
+    """
+    return message.get_all(key)
+
+
+if sys.version_info < (3,):
+
+    def get_all_headers(message, key):
+        return message.getheaders(key)