[libpng16] Bump version to 1.6.7rc03

CHANGES

diff --git a/CHANGES b/CHANGES
index 7c47035..0bbd887 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4711,6 +4711,8 @@
   Fixed #include in filter_neon_intrinsics.c and ctype macros. The ctype char
     checking macros take an unsigned char argument, not a signed char.
 
+Version 1.6.7rc03 [November 7, 2013]
+
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