fix compiler crash due to missing parameter in subtype signature

Cython/Compiler/TreeFragment.py

@@ -32,7 +32,7 @@ class StringParseContext(Main.Context):
                               create_testscope=False)
         self.module_name = name
 
-    def find_module(self, module_name, relative_to=None, pos=None, need_pxd=1):
+    def find_module(self, module_name, relative_to=None, pos=None, need_pxd=1, absolute_fallback=True):
         if module_name not in (self.module_name, 'cython'):
             raise AssertionError("Not yet supporting any cimports/includes from string code snippets")
         return ModuleScope(module_name, parent_module=None, context=self)