api! Remove the experimental (and incomplete) ERROR_NUMBERS code
The purpose of this feature is to optionally prepend standardized
numbers to error and warning messages. The ERROR_NUMBERS feature was
first drafted in libpng-1.2.0 and further developed in libpng-1.4.0;
and yet, it was always disabled by default, and never completed.
In the light of a recent report concerning the security hazards arising
from enabling this code in custom libpng builds, we think it's best to
simply remove all the code written to support this feature.
Based on removal in libpng18, but keeping functions and options as
no-ops for backwards compatibility.
Co-authored-by: Cosmin Truta <ctruta@gmail.com>
4 files changed
