poco: fix symbol export macro

[star-hengxing]

#8431

[gemini-code-assist]

Summary of Changes

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This pull request resolves an issue related to the POCO library's symbol export mechanism when configured for static linking. By introducing a conditional define, POCO_STATIC, the change ensures that the library's symbols are correctly handled during static compilation, preventing potential linking errors and improving compatibility for static builds.

Highlights

• POCO_STATIC Define: The POCO_STATIC preprocessor define is now conditionally added to the POCO package configuration when it is built as a static library. This ensures proper symbol export and linking behavior for static builds.

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[gemini-code-assist]

Code Review

This pull request correctly addresses an issue with symbol exports when using POCO as a static library. By adding the POCO_STATIC preprocessor define for consumers of the package during static builds, it ensures that symbols are correctly imported, preventing linker errors. The change is placed appropriately in the on_load function, making it conditional on the build configuration. The implementation is clean and correct.