fix: Added mingw patch

[joda01]

Summary

Changes to recipe: onnx/1.16.2

Motivation

See #25468

Details

I added #undef OPTIONAL to the lib header which undefs the predefined macro from windows.h.

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• [x] Checked that this PR is not a duplicate: list of PRs by recipe
• [x] Tested locally with at least one configuration using a recent version of Conan