Add zip.exe for building releases.

Util/Misc/zip.exe.LICENSE

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+This is version 2007-Mar-4 of the Info-ZIP license.
+The definitive version of this document should be available at
+ftp://ftp.info-zip.org/pub/infozip/license.html indefinitely and
+a copy at http://www.info-zip.org/pub/infozip/license.html.
+
+
+Copyright (c) 1990-2007 Info-ZIP.  All rights reserved.
+
+For the purposes of this copyright and license, "Info-ZIP" is defined as
+the following set of individuals:
+
+   Mark Adler, John Bush, Karl Davis, Harald Denker, Jean-Michel Dubois,
+   Jean-loup Gailly, Hunter Goatley, Ed Gordon, Ian Gorman, Chris Herborth,
+   Dirk Haase, Greg Hartwig, Robert Heath, Jonathan Hudson, Paul Kienitz,
+   David Kirschbaum, Johnny Lee, Onno van der Linden, Igor Mandrichenko,
+   Steve P. Miller, Sergio Monesi, Keith Owens, George Petrov, Greg Roelofs,
+   Kai Uwe Rommel, Steve Salisbury, Dave Smith, Steven M. Schweda,
+   Christian Spieler, Cosmin Truta, Antoine Verheijen, Paul von Behren,
+   Rich Wales, Mike White.
+
+This software is provided "as is," without warranty of any kind, express
+or implied.  In no event shall Info-ZIP or its contributors be held liable
+for any direct, indirect, incidental, special or consequential damages
+arising out of the use of or inability to use this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the above disclaimer and the following restrictions:
+
+    1. Redistributions of source code (in whole or in part) must retain
+       the above copyright notice, definition, disclaimer, and this list
+       of conditions.
+
+    2. Redistributions in binary form (compiled executables and libraries)
+       must reproduce the above copyright notice, definition, disclaimer,
+       and this list of conditions in documentation and/or other materials
+       provided with the distribution.  The sole exception to this condition
+       is redistribution of a standard UnZipSFX binary (including SFXWiz) as
+       part of a self-extracting archive; that is permitted without inclusion
+       of this license, as long as the normal SFX banner has not been removed
+       from the binary or disabled.
+
+    3. Altered versions--including, but not limited to, ports to new operating
+       systems, existing ports with new graphical interfaces, versions with
+       modified or added functionality, and dynamic, shared, or static library
+       versions not from Info-ZIP--must be plainly marked as such and must not
+       be misrepresented as being the original source or, if binaries,
+       compiled from the original source.  Such altered versions also must not
+       be misrepresented as being Info-ZIP releases--including, but not
+       limited to, labeling of the altered versions with the names "Info-ZIP"
+       (or any variation thereof, including, but not limited to, different
+       capitalizations), "Pocket UnZip," "WiZ" or "MacZip" without the
+       explicit permission of Info-ZIP.  Such altered versions are further
+       prohibited from misrepresentative use of the Zip-Bugs or Info-ZIP
+       e-mail addresses or the Info-ZIP URL(s), such as to imply Info-ZIP
+       will provide support for the altered versions.
+
+    4. Info-ZIP retains the right to use the names "Info-ZIP," "Zip," "UnZip,"
+       "UnZipSFX," "WiZ," "Pocket UnZip," "Pocket Zip," and "MacZip" for its
+       own source and binary releases.