[libpng16] Imported from libpng-1.6.20beta03.tar

ANNOUNCE

@@ -1,4 +1,4 @@
-Libpng 1.6.20beta02 - November 23, 2015
+Libpng 1.6.20beta03 - November 24, 2015
 
 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.
@@ -8,20 +8,20 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.6.20beta02.tar.xz (LZMA-compressed, recommended)
-   1.6.20beta02.tar.gz
+   1.6.20beta03.tar.xz (LZMA-compressed, recommended)
+   1.6.20beta03.tar.gz
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1620b02.7z  (LZMA-compressed, recommended)
-   lp1620b02.zip
+   lp1620b03.7z  (LZMA-compressed, recommended)
+   lp1620b03.zip
 
 Other information:
 
-   1.6.20beta02-README.txt
-   1.6.20beta02-LICENSE.txt
-   libpng-1.6.20beta02-*.asc (armored detached GPG signatures)
+   1.6.20beta03-README.txt
+   1.6.20beta03-LICENSE.txt
+   libpng-1.6.20beta03-*.asc (armored detached GPG signatures)
 
 Changes since the last public release (1.6.19):
 
@@ -29,10 +29,13 @@ Version 1.6.20beta01 [November 20, 2015]
   Avoid potential pointer overflow/underflow in png_handle_sPLT() and
     png_handle_pCAL() (Bug report by John Regehr).
 
-Version 1.6.20beta02 [(PENDING RELEASE)]
+Version 1.6.20beta02 [November 23, 2015]
   Fixed bug recently introduced in png_set_PLTE() that uses png_ptr
     not info_ptr.
 
+Version 1.6.20beta03 [(PENDING RELEASE)]
+  Backported tests from libpng-1.7.0beta69.
+
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