Add compatibility entries for the annotation, catalog, font-name, page-object and text-object APIs that the pinned source no longer exports. These are not used by the preview renderer, but all dynamic bindings must resolve before the library can load.
Define FPDF_IMPLEMENTATION before the PDFium headers so FPDF_EXPORT applies default visibility; without it the compatibility functions were compiled hidden and dlsym still failed.
The compatibility translation unit uses FPDF_STRUCTELEMENT_ATTR_VALUE, which pdfium-render expects but the pinned OHOS header no longer declares. Add the opaque typedef locally.
pdfium-render 0.9.4 dynamically binds several optional struct-tree, text, font-map and page-move APIs that the pinned OHOS source no longer exports. Add a compatibility translation unit for the missing symbols so the library can load; the preview path only uses the core render APIs.
The source port exposes FPDF_GetDocPermissions with user semantics but no separate FPDF_GetDocUserPermissions symbol required by pdfium-render 0.9.4. Apply a pinned source patch that adds the compatibility entry point, and rebuild the CI artifact.
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