smartptr inheritance fix when using templates and typedefs

Fixes SF bug 3333549 - %shared_ptr fixes when the type is a template using
template parameters that are typedef'd to another type.

Also fixes python -O optimization where the smart pointer conversion to the
base class needs to work because of the virtual methods that have been
optimized away.

Examples/test-suite/python/li_boost_shared_ptr_template_runme.py

@@ -8,9 +8,8 @@ if d.bar() != 2:
     raise RuntimeError
 if bar_getter(b) != 1:
     raise RuntimeError
-# Fix reverted in rev 12953
-# if bar_getter(d) != 2:
-#  raise RuntimeError
+if bar_getter(d) != 2:
+    raise RuntimeError
 
 b = BaseDefaultInt()
 d = DerivedDefaultInt()