make CTypedefType.declaration_code() honor dll_linkage

Cython/Compiler/PyrexTypes.py

@@ -202,7 +202,11 @@ class CTypedefType(BaseType):
     def declaration_code(self, entity_code, 
             for_display = 0, dll_linkage = None, pyrex = 0):
         name = self.declaration_name(for_display, pyrex)
-        return self.base_declaration_code(name, entity_code)
+        if pyrex or for_display:
+            base_code = name
+        else:
+            base_code = public_decl(name, dll_linkage)
+        return self.base_declaration_code(base_code, entity_code)
     
     def declaration_name(self, for_display = 0, pyrex = 0):
         if pyrex or for_display: