Roll back use of __class__; neither C nor Python proxy can directly l…

…ie to 'type'. This turns out to be a bug in the zope.security.proxy.removeSecurityProxy function under pure-Python, so the build won't be green until zopefoundation/zope.security#11 or something like it is released.

src/zope/pagetemplate/engine.py

@@ -171,7 +171,7 @@ def evaluateMacro(self, expr):
         ...
         >>> zc = ZopeContext(ExpressionEngine, {})
         >>> out = zc.evaluateMacro(expression)
-        >>> out.__class__
+        >>> type(out)
         <type 'list'>
 
         The method does some trivial checking to make sure we are getting