Remove svcntd() from unknown symbols

src/pystencils/astnodes.py

@@ -270,6 +270,7 @@ class KernelFunction(Node):
         parameters = [self.Parameter(symbol, get_fields(symbol)) for symbol in argument_symbols]
         if hasattr(self, 'indexing'):
             parameters += [self.Parameter(s, []) for s in self.indexing.symbolic_parameters()]
+        parameters = [p for p in parameters if p.symbol.name != "svcntd()"]
         parameters.sort(key=lambda p: p.symbol.name)
         return parameters