Put cimported includes first.

Cython/Compiler/ModuleNode.py

@@ -545,11 +545,14 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
         code.putln("#endif")
 
     def generate_includes(self, env, cimported_modules, code):
-        includes = env.include_files[:]
+        includes = []
         for module in cimported_modules:
             for filename in module.include_files:
                 if filename not in includes:
                     includes.append(filename)
+        for filename in env.include_files[:]
+            if filename not in includes:
+                includes.append(filename)
         for filename in includes:
             code.putln('#include "%s"' % filename)