[libpng16] Note in CHANGES that configure files were rebuilt with autoconf-2.69

ANNOUNCE

@@ -562,6 +562,7 @@ Version 1.6.0beta33 [December 15, 2012]
     to the hardware subdirectory and added comments to pngrutil.c so that
     implementors of other optimizations know what to do.
   Fixed cases of unquoted DESTDIR in Makefile.am
+  Rebuilt Makefile.in, configure, etc., with autoconf-2.69 and automake-1.2.5.
 
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CHANGES

@@ -4304,7 +4304,6 @@ Version 1.6.0beta32 [November 25, 2012]
   Fixed error checking in the simplified write API (Olaf van der Spek)
   Made png_user_version_check() ok to use with libpng version 1.10.x and later.
 
-  Fixed cases of unquoted DESTDIR in Makefile.am
 Version 1.6.0beta33 [December 15, 2012]
   Fixed typo in png.c (PNG_SET_CHUNK_MALLOC_MAX should be PNG_CHUNK_MALLOC_MAX)
     that causes the MALLOC_MAX limit not to work (John Bowler)
@@ -4315,6 +4314,7 @@ Version 1.6.0beta33 [December 15, 2012]
     to the hardware subdirectory and added comments to pngrutil.c so that
     implementors of other optimizations know what to do.
   Fixed cases of unquoted DESTDIR in Makefile.am
+  Rebuilt Makefile.in, configure, etc., with autoconf-2.69 and automake-1.2.5.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit