Update to libpng 1.5.26
Includes numerous security fixes compared to the previous version which was around 1.5.7 or so. Fixes #2787
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@@ -1,8 +1,8 @@
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/* pngwio.c - functions for data output
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*
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* Last changed in libpng 1.5.0 [January 6, 2011]
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* Copyright (c) 1998-2011 Glenn Randers-Pehrson
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* Last changed in libpng 1.5.18 [February 6, 2014]
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* Copyright (c) 1998-2002,2004,2006-2014 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
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@@ -207,6 +207,8 @@ png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
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# else
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png_ptr->output_flush_fn = output_flush_fn;
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# endif
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#else
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PNG_UNUSED(output_flush_fn)
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#endif /* PNG_WRITE_FLUSH_SUPPORTED */
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/* It is an error to read while writing a png file */
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