Fix the archive code so that it compiles in a stricter mode.

utils/archive/entry.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #library("entry");
 
 #import("dart:io");
 #import("archive.dart", prefix: "archive");
 #import("entry_request.dart");
 #import("read_request.dart", prefix: 'read');
@@ skipping 50 matching lines @@
   /** If this entry is a hardlink, this is the destination. Otherwise, null. */
   String get hardlink() => _properties[1];
   set hardlink(String value) => _set(SET_HARDLINK, 1, value);
 
   /** The path to this entry in the archive. */
   String get pathname() => _properties[2];
   set pathname(String value) => _set(SET_PATHNAME, 2, value);
 
   /** The path to this entry on disk, */
   String get sourcepath() => _properties[3];
-  set sourcepath(String value) => _set(SET_SOURCEPATH, 3, value);
 
   /** If this entry is a symlink, this is the destination. Otherwise, null. */
   String get symlink() => _properties[4];
   set symlink(String value) => _set(SET_SYMLINK, 4, value);
 
   /** The group identifier for this entry. */
   int get gid() => _properties[5];
   set gid(int value) => _set(SET_GID, 5, value);
 
   /** The user identifier for this entry. */
@@ skipping 37 matching lines @@
   int get fflags_clear() => _properties[12];
   set fflags_clear(int value) => _set(SET_FFLAGS_CLEAR, 12, value);
 
   /**
    * The textual representation of the file flags for this entry.
    *
    * Note that if you set [fflags_set] or [fflags_clear], this value will not
    * change, and vice versa.
    */
   String get fflags_text() => _properties[13];
-  set fflags_text(String value) => _set(SET_FFLAGS_TEXT, 13, value);
 
   /** The filetype bitmask for this entry. */
   int get filetype_mask() => _properties[14];
   set filetype_mask(int value) => _set(SET_FILETYPE, 14, value);
 
   /** The filetype and permissions bitmask for this entry. */
   int get mode_mask() => _properties[15];
   set mode_mask(int value) => _set(SET_MODE, 15, value);
 
   /** The size of this entry in bytes, or null if it's unset. */
@@ skipping 190 matching lines @@
 class CompleteArchiveEntry extends ArchiveEntry {
   /** The contents of the entry as bytes. */
   final List<int> contentBytes;
 
   /** The contents of the entry as a string. */
   String get contents() => new String.fromCharCodes(contentBytes);
 
   CompleteArchiveEntry._(List properties, this.contentBytes)
     : super.internal(properties, null);
 }