[libpng16] Imported from libpng-1.6.8rc02.tar

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.6.8rc01 - December 12, 2013
+Libpng 1.6.8rc02 - December 14, 2013
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -9,24 +9,24 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.6.8rc01.tar.xz (LZMA-compressed, recommended)
-   1.6.8rc01.tar.gz
+   1.6.8rc02.tar.xz (LZMA-compressed, recommended)
+   1.6.8rc02.tar.gz
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp168r01.7z  (LZMA-compressed, recommended)
-   lp168r01.zip
+   lp168r02.7z  (LZMA-compressed, recommended)
+   lp168r02.zip
 
 Other information:
 
-   1.6.8rc01-README.txt
-   1.6.8rc01-LICENSE.txt
+   1.6.8rc02-README.txt
+   1.6.8rc02-LICENSE.txt
    Gnupg/*.asc (PGP armored detached signatures)
 
 Changes since the last public release (1.6.7):
 
-Version 1.6.8beta01 [December 12, 2013]
+Version 1.6.8beta01 [November 24, 2013]
   Changed #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED in pngpread.c to
     #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED to be consistent with
     what is in pngpriv.h.
@@ -54,6 +54,12 @@ Version 1.6.8beta02 [November 30, 2013]
 Version 1.6.8rc01 [December 12, 2013]
   Tidied up pngfix inits and fixed pngtest no-write builds.
 
+Version 1.6.8rc02 [December 14, 2013]
+  Handle zero-length PLTE chunk or NULL palette with png_error()
+    instead of png_chunk_report(), which by default issues a warning
+    rather than an error, leading to later reading from a NULL pointer
+    (png_ptr->palette) in png_do_expand_palette().
+
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