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Fix the real allocation size in OpenBSD rallocx shim

Ondřej Surý requested to merge 2815-crashes-related-to-memory-reallocation-on-openbsd into main

In the rallocx() shim for OpenBSD (that's the only platform that doesn't have malloc_size() or malloc_usable_size() equivalent), the newly allocated size was missing the extra size_t member for storing the allocation size leading to size_t sized overflow at the end of the reallocated memory chunk.

Closes #2815 (closed)

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