[build] rewriting the build system

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diff --git a/src/stubs/java/lang/annotation/ElementType.java b/src/stubs/java/lang/annotation/ElementType.java
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+/*
+ * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.lang.annotation;
+
+/**
+ * The constants of this enumerated type provide a simple classification of the
+ * syntactic locations where annotations may appear in a Java program. These
+ * constants are used in {@link java.lang.annotation.Target Target}
+ * meta-annotations to specify where it is legal to write annotations of a
+ * given type.
+ *
+ * <p>The syntactic locations where annotations may appear are split into
+ * <em>declaration contexts</em> , where annotations apply to declarations, and
+ * <em>type contexts</em> , where annotations apply to types used in
+ * declarations and expressions.
+ *
+ * <p>The constants {@link #ANNOTATION_TYPE}, {@link #CONSTRUCTOR}, {@link
+ * #FIELD}, {@link #LOCAL_VARIABLE}, {@link #METHOD}, {@link #PACKAGE}, {@link
+ * #MODULE}, {@link #PARAMETER}, {@link #TYPE}, and {@link #TYPE_PARAMETER}
+ * correspond to the declaration contexts in JLS 9.6.4.1.
+ *
+ * <p>For example, an annotation whose type is meta-annotated with
+ * {@code @Target(ElementType.FIELD)} may only be written as a modifier for a
+ * field declaration.
+ *
+ * <p>The constant {@link #TYPE_USE} corresponds to the type contexts in JLS
+ * 4.11, as well as to two declaration contexts: type declarations (including
+ * annotation type declarations) and type parameter declarations.
+ *
+ * <p>For example, an annotation whose type is meta-annotated with
+ * {@code @Target(ElementType.TYPE_USE)} may be written on the type of a field
+ * (or within the type of the field, if it is a nested, parameterized, or array
+ * type), and may also appear as a modifier for, say, a class declaration.
+ *
+ * <p>The {@code TYPE_USE} constant includes type declarations and type
+ * parameter declarations as a convenience for designers of type checkers which
+ * give semantics to annotation types. For example, if the annotation type
+ * {@code NonNull} is meta-annotated with
+ * {@code @Target(ElementType.TYPE_USE)}, then {@code @NonNull}
+ * {@code class C {...}} could be treated by a type checker as indicating that
+ * all variables of class {@code C} are non-null, while still allowing
+ * variables of other classes to be non-null or not non-null based on whether
+ * {@code @NonNull} appears at the variable's declaration.
+ *
+ * @author  Joshua Bloch
+ * @since 1.5
+ * @jls 9.6.4.1 @Target
+ * @jls 4.1 The Kinds of Types and Values
+ */
+public enum ElementType {
+    /** Class, interface (including annotation type), or enum declaration */
+    TYPE,
+
+    /** Field declaration (includes enum constants) */
+    FIELD,
+
+    /** Method declaration */
+    METHOD,
+
+    /** Formal parameter declaration */
+    PARAMETER,
+
+    /** Constructor declaration */
+    CONSTRUCTOR,
+
+    /** Local variable declaration */
+    LOCAL_VARIABLE,
+
+    /** Annotation type declaration */
+    ANNOTATION_TYPE,
+
+    /** Package declaration */
+    PACKAGE,
+
+    /**
+     * Type parameter declaration
+     *
+     * @since 1.8
+     */
+    TYPE_PARAMETER,
+
+    /**
+     * Use of a type
+     *
+     * @since 1.8
+     */
+    TYPE_USE,
+
+    /**
+     * Module declaration.
+     *
+     * @since 9
+     */
+    MODULE
+}