[libpng16] Correct configure builds where build and source directories are

separate.  The include path of 'config.h' was erroneously made relative in
pngvalid.c in libpng 1.5.7.
diff --git a/CHANGES b/CHANGES
index 0843e8e..c34e0d2 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3805,10 +3805,10 @@
     temporary files for suffix rules to always use $* and ensures that the
     non-suffix rules use unique file names.
 
-Version 1.6.0beta02 [December 17, 2011]
-  Added bsconfig.h file.  This indirect reference to config.h avoids
-    problems with build scripts that search for config.h and find an
-    inappropriate one in the standard paths.
+Version 1.6.0beta02 [December 18, 2011]
+  Correct configure builds where build and source directories are separate.
+    The include path of 'config.h' was erroneously made relative in pngvalid.c
+    in libpng 1.5.7.
 
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