[libpng16] Update "last changed" comment in pngset.c

ANNOUNCE

@@ -36,8 +36,6 @@ Version 1.6.17beta01 [January 13, 2015]
   Fixed byte order in 2-byte filler, in png_do_read_filler().
   Made the check for out-of-range values in png_set_tRNS() detect
     values that are exactly 2^bit_depth, and work on 16-bit platforms.
-  Made the check for out-of-range values in png_set_tRNS() detect
-    values that are exactly 2^bit_depth, and work on 16-bit platforms.
 
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pngset.c

 
 /* pngset.c - storage of image information into info struct
  *
- * Last changed in libpng 1.6.15 [November 20, 2014]
+ * Last changed in libpng 1.6.17 [(PENDING RELEASE)]
  * Copyright (c) 1998-2014 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)