[libpng16] Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c

CHANGES

diff --git a/CHANGES b/CHANGES
index ac041df..159a0c3 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4593,8 +4593,8 @@
   Revised example.c to illustrate use of PNG_DEFAULT_sRGB and PNG_GAMMA_MAC_18
     as parameters for png_set_gamma().  These have been available since
     libpng-1.5.4.
-  Revised contrib/tools/png-fix-too-far-back.c to check all compressed chunks
-    known to libpng.
+  Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c and revised it
+    to check all compressed chunks known to libpng.
 
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