Fix style and copyrights.

Author: fangerer

graalpython/com.oracle.graal.python.cext/src/_warnings.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * The Universal Permissive License (UPL), Version 1.0

graalpython/com.oracle.graal.python.cext/src/errors.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * The Universal Permissive License (UPL), Version 1.0

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/CExtNodes.java

@@ -70,7 +70,6 @@
 import com.oracle.graal.python.builtins.objects.cext.CExtNodesFactory.GetTypeMemberNodeGen;
 import com.oracle.graal.python.builtins.objects.cext.CExtNodesFactory.IsPointerNodeGen;
 import com.oracle.graal.python.builtins.objects.cext.CExtNodesFactory.ObjectUpcallNodeGen;
-import com.oracle.graal.python.builtins.objects.cext.CExtNodesFactory.PointerCompareNodeGen;
 import com.oracle.graal.python.builtins.objects.cext.CExtNodesFactory.TernaryFirstSecondToSulongNodeGen;
 import com.oracle.graal.python.builtins.objects.cext.CExtNodesFactory.TernaryFirstThirdToSulongNodeGen;
 import com.oracle.graal.python.builtins.objects.cext.CExtNodesFactory.TransformExceptionToNativeNodeGen;

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/NativeCAPISymbols.java

@@ -130,7 +130,6 @@ public abstract class NativeCAPISymbols {
     private static final String FUN_GET_DOUBLE_PTR_T_TYPEID = "get_double_ptr_t_typeid";
     private static final String FUN_GET_PY_SSIZE_PTR_T_TYPEID = "get_Py_ssize_ptr_t_typeid";
 
-
     @CompilationFinal(dimensions = 1) private static final String[] values;
     static {
         Field[] declaredFields = NativeCAPISymbols.class.getDeclaredFields();