win32: ensure data symbols are correctly annotated - #946
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Without this, the linker may treat data symbols as functions and generate import thunks for them, which can cause crashes.
This was referenced Aug 14, 2026
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Without this, the linker may treat data symbols as functions and generate import thunks for them, which can cause crashes.
Fixes: strukturag/libheif#357.
Additional context: https://blog.s-schoener.com/2025-06-15-windows-data-linker/.