SDL_image: png: removed LGPL copyright text, filler comments, and obsolete email address.

From 6208b661d2b59ba9e1481642cf100a1011f56ac4 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Tue, 5 Nov 2019 16:49:33 -0500
Subject: [PATCH] png: removed LGPL copyright text, filler comments, and
 obsolete email address.

Philippe Lavoie gave us written permission to explicitly relicense this as
code under the zlib license, like the rest of SDL and SDL_image.

cherry-picked from commit c5e4e657fd053d2c712f6d2bf9cbd668d5f41425
---
 IMG_png.c | 33 +--------------------------------
 1 file changed, 1 insertion(+), 32 deletions(-)

diff --git a/IMG_png.c b/IMG_png.c
index 228d927..5931e8c 100644
--- a/IMG_png.c
+++ b/IMG_png.c
@@ -30,38 +30,7 @@
 
 #ifdef LOAD_PNG
 
-/*=============================================================================
-        File: SDL_png.c
-     Purpose: A PNG loader and saver for the SDL library      
-    Revision: 
-  Created by: Philippe Lavoie          (2 November 1998)
-              lavoie@zeus.genie.uottawa.ca
- Modified by: 
-
- Copyright notice:
-          Copyright (C) 1998 Philippe Lavoie
- 
-          This library is free software; you can redistribute it and/or
-          modify it under the terms of the GNU Library General Public
-          License as published by the Free Software Foundation; either
-          version 2 of the License, or (at your option) any later version.
- 
-          This library 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
-          Library General Public License for more details.
- 
-          You should have received a copy of the GNU Library General Public
-          License along with this library; if not, write to the Free
-          Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-    Comments: The load and save routine are basically the ones you can find
-             in the example.c file from the libpng distribution.
-
-  Changes:
-    5/17/99 - Modified to use the new SDL data sources - Sam Lantinga
-
-=============================================================================*/
+/* This code was originally written by Philippe Lavoie (2 November 1998) */
 
 #include "SDL_endian.h"