Fix libavif build on VS2019 syntax error

[crazywhalecc]

What does this PR do?

Created upstream issue: AOMediaCodec/libavif#2686, and fix #648

Checklist before merging

If your PR involves the changes mentioned below and completed the action, please tick the corresponding option.
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• If you modified *.php, run composer cs-fix at local machine.
• If it's an extension or dependency update, make sure adding related extensions in src/global/test-extensions.php.
• If you changed the behavior of static-php-cli, update docs in ./docs/.
• If you updated config/xxx.json content, run bin/spc dev:sort-config xxx.