Update libpng to 1.6.58 and zlib-ng to 2.3.3. - #203
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Summary
Security
The libpng update incorporates upstream fixes for vulnerabilities affecting older releases, including:
zlib-ng is used by the native PNG codec through the
pspngport. The zlib-ng 2.3.3 release does not identify a specific CVE, but includes upstream correctness and hardening fixes.Other improvements
minigzip, and several compiler, build-system, and platform-detection issues.