language/environment: remove attr_rtresult

This function has the typical side effect of clearing the result. When happening in build(), this caused minor trouble when using pipelined scheduling (no result displayed at all until run() proceeds).

artiq/language/environment.py

@@ -223,12 +223,6 @@ class HasEnvironment:
                 raise ValueError("Result is already realtime")
             self.__rdb.nrt[key] = value
 
-    def attr_rtresult(self, key, init_value):
-        """Writes the value of a real-time result and sets the corresponding
-        ``Notifier`` as attribute. The names of the result and of the
-        attribute are the same."""
-        setattr(self, key, set_result(key, init_value, True))
-
     def get_result(self, key):
         """Retrieves the value of a result.