no var keywords in str()

Author: tomasstupka

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/BuiltinConstructors.java

@@ -1902,7 +1902,7 @@ public PSet listObject(@SuppressWarnings("unused") Object cls, Object arg) {
 
     // str(object='')
     // str(object=b'', encoding='utf-8', errors='strict')
-    @Builtin(name = STR, minNumOfPositionalArgs = 1, parameterNames = {"cls", "object", "encoding", "errors"}, takesVarKeywordArgs = true, constructsClass = PythonBuiltinClassType.PString)
+    @Builtin(name = STR, minNumOfPositionalArgs = 1, parameterNames = {"cls", "object", "encoding", "errors"}, constructsClass = PythonBuiltinClassType.PString)
     @GenerateNodeFactory
     public abstract static class StrNode extends PythonBuiltinNode {
         @Child private LookupAndCallTernaryNode callDecodeNode;