Remove old iossim code (pre-Xcode 8) and class-dump.

third_party/class-dump/README

Index: third_party/class-dump/README
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-class-dump is a command-line utility for examining the Objective-C
-segment of Mach-O files.  It generates declarations for the classes,
-categories and protocols.  This is the same information provided by
-using 'otool -ov', but presented as normal Objective-C declarations.
-
-The latest version and information is available at:
-
-    <http://www.codethecode.com/projects/class-dump>
-
------
-
-This file is part of class-dump, a utility for examining the
-Objective-C segment of Mach-O files.
-Copyright (C) 1997-1998, 2000-2001, 2004-2010 Steve Nygard.
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
-
-This program 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-You may contact the author by:
-   e-mail:  class-dump at codethecode.com