[devel] Made png_set_chop_16() API removeable

by disabling PNG_CHOP_16_TO_8_SUPPORTED

CHANGES

diff --git a/CHANGES b/CHANGES
index 0d4e02b..552e6d7 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3463,6 +3463,7 @@
   Removed the ACCURATE and LEGACY options (they are no longer useable)
   Use the old scaling method for background if png_set_chop_16() was
     called.
+  Made png_set_chop_16() API removeable by disabling PNG_CHOP_16_TO_8_SUPPORTED
 
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