8217676: Upgrade libpng to 1.6.37

Reviewed-by: prr, jdv, kcr

langtools/THIRD_PARTY_README

@@ -1001,67 +1001,97 @@ included with JDK 7 and OpenJDK 7 source distributions.
 
 -------------------------------------------------------------------------------
 
-%% This notice is provided with respect to libpng 1.6.16, which is 
+%% This notice is provided with respect to libpng 1.6.37, which may be
 included with JRE 7, JDK 7, and OpenJDK 7.
 
 --- begin of LICENSE ---
 
-This copy of the libpng notices is provided for your convenience.  In case of
+COPYRIGHT NOTICE, DISCLAIMER, and LICENSE
-any discrepancy between this copy and the notices in the file png.h that is
+=========================================
-included in the libpng distribution, the latter shall prevail.
 
-COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
+PNG Reference Library License version 2
+---------------------------------------
 
-If you modify libpng you may insert additional notices immediately following
+ * Copyright (c) 1995-2019 The PNG Reference Library Authors.
-this sentence.
+ * Copyright (c) 2018-2019 Cosmin Truta.
+ * Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson.
+ * Copyright (c) 1996-1997 Andreas Dilger.
+ * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
 
-This code is released under the libpng license.
+The software is supplied "as is", without warranty of any kind,
+express or implied, including, without limitation, the warranties
+of merchantability, fitness for a particular purpose, title, and
+non-infringement.  In no event shall the Copyright owners, or
+anyone distributing the software, be liable for any damages or
+other liability, whether in contract, tort or otherwise, arising
+from, out of, or in connection with the software, or the use or
+other dealings in the software, even if advised of the possibility
+of such damage.
 
-libpng versions 1.2.6, August 15, 2004, through 1.6.16, December 22, 2014, are
+Permission is hereby granted to use, copy, modify, and distribute
-Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are
+this software, or portions hereof, for any purpose, without fee,
+subject to the following restrictions:
+
+ 1. The origin of this software must not be misrepresented; you
+    must not claim that you wrote the original software.  If you
+    use this software in a product, an acknowledgment in the product
+    documentation would be appreciated, but is not required.
+
+ 2. Altered source versions must be plainly marked as such, and must
+    not be misrepresented as being the original software.
+
+ 3. This Copyright notice may not be removed or altered from any
+    source or altered source distribution.
+
+
+PNG Reference Library License version 1 (for libpng 0.5 through 1.6.35)
+-----------------------------------------------------------------------
+
+libpng versions 1.2.6, August 15, 2004, through 1.6.35, July 15, 2018 are
+Copyright (c) 2004, 2006-2018 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
 
-   Cosmin Truta
+    Cosmin Truta
 
 libpng versions 1.0.7, July 1, 2000, through 1.2.5 - October 3, 2002, are
 Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.0.6
 with the following individuals added to the list of Contributing Authors
 
-   Simon-Pierre Cadieux
+    Simon-Pierre Cadieux
-   Eric S. Raymond
+    Eric S. Raymond
-   Gilles Vollant
+    Gilles Vollant
 
 and with the following additions to the disclaimer:
 
-   There is no warranty against interference with your enjoyment of the
+    There is no warranty against interference with your enjoyment of
-   library or against infringement.  There is no warranty that our
+    the library or against infringement.  There is no warranty that our
-   efforts or the library will fulfill any of your particular purposes
+    efforts or the library will fulfill any of your particular purposes
-   or needs.  This library is provided with all faults, and the entire
+    or needs.  This library is provided with all faults, and the entire
-   risk of satisfactory quality, performance, accuracy, and effort is with
+    risk of satisfactory quality, performance, accuracy, and effort is
-   the user.
+    with the user.
 
 libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
 Copyright (c) 1998, 1999 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-0.96,
 with the following individuals added to the list of Contributing Authors:
 
-   Tom Lane
+    Tom Lane
-   Glenn Randers-Pehrson
+    Glenn Randers-Pehrson
-   Willem van Schaik
+    Willem van Schaik
 
 libpng versions 0.89, June 1996, through 0.96, May 1997, are
 Copyright (c) 1996, 1997 Andreas Dilger
 Distributed according to the same disclaimer and license as libpng-0.88,
 with the following individuals added to the list of Contributing Authors:
 
-   John Bowler
+    John Bowler
-   Kevin Bracey
+    Kevin Bracey
-   Sam Bushell
+    Sam Bushell
-   Magnus Holmgren
+    Magnus Holmgren
-   Greg Roelofs
+    Greg Roelofs
-   Tom Tanner
+    Tom Tanner
 
 libpng versions 0.5, May 1995, through 0.88, January 1996, are
 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
@@ -1069,19 +1099,20 @@ Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
 For the purposes of this copyright and license, "Contributing Authors"
 is defined as the following set of individuals:
 
-   Andreas Dilger
+    Andreas Dilger
-   Dave Martindale
+    Dave Martindale
-   Guy Eric Schalnat
+    Guy Eric Schalnat
-   Paul Schmidt
+    Paul Schmidt
-   Tim Wegner
+    Tim Wegner
 
-The PNG Reference Library is supplied "AS IS".  The Contributing Authors
+The PNG Reference Library is supplied "AS IS".  The Contributing
-and Group 42, Inc. disclaim all warranties, expressed or implied,
+Authors and Group 42, Inc. disclaim all warranties, expressed or
-including, without limitation, the warranties of merchantability and of
+implied, including, without limitation, the warranties of
-fitness for any purpose.  The Contributing Authors and Group 42, Inc.
+merchantability and of fitness for any purpose.  The Contributing
-assume no liability for direct, indirect, incidental, special, exemplary,
+Authors and Group 42, Inc. assume no liability for direct, indirect,
-or consequential damages, which may result from the use of the PNG
+incidental, special, exemplary, or consequential damages, which may
-Reference Library, even if advised of the possibility of such damage.
+result from the use of the PNG Reference Library, even if advised of
+the possibility of such damage.
 
 Permission is hereby granted to use, copy, modify, and distribute this
 source code, or portions hereof, for any purpose, without fee, subject