[libpng16] Bump version to 1.6.33beta02

ANNOUNCE

@@ -1,4 +1,4 @@
-Libpng 1.6.33beta01 - August 29, 2017
+Libpng 1.6.33beta02 - August 30, 2017
 
 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.
@@ -8,27 +8,32 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.6.33beta01.tar.xz (LZMA-compressed, recommended)
-   1.6.33beta01.tar.gz
+   1.6.33beta02.tar.xz (LZMA-compressed, recommended)
+   1.6.33beta02.tar.gz
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1633b01.7z  (LZMA-compressed, recommended)
-   lp1633b01.zip
+   lp1633b02.7z  (LZMA-compressed, recommended)
+   lp1633b02.zip
 
 Other information:
 
-   1.6.33beta01-README.txt
-   1.6.33beta01-LICENSE.txt
-   libpng-1.6.33beta01-*.asc (armored detached GPG signatures)
+   1.6.33beta02-README.txt
+   1.6.33beta02-LICENSE.txt
+   libpng-1.6.33beta02-*.asc (armored detached GPG signatures)
 
 Changes since the last public release (1.6.32):
+Version 1.6.33beta01 [August 28, 2017]
   Added PNGMINUS_UNUSED macro to contrib/pngminus/p*.c and added missing
     parenthesis in contrib/pngminus/pnm2png.c (bug report by Christian Hesse).
   Fixed off-by-one error in png_do_check_palette_indexes() (Bug report
     by Mick P., Source Forge Issue #269).
 
+Version 1.6.33beta02 [August 30, 2017]
+  Initialize png_handler.row_ptr in contrib/oss-fuzz/libpng_read_fuzzer.cc
+    to fix shortlived oss-fuzz issue 3234.
+
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