runtime: correct the asprintf shim for Windows
#32898
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Ensure that the string that is formed from the `asprintf` call is null-terminated. The `_vsnprintf` call will not null-terminate the string if the length is not sufficient.
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Ensure that the string that is formed from the
asprintfcall isnull-terminated. The
_vsnprintfcall will not null-terminate thestring if the length is not sufficient.
Replace this paragraph with a description of your changes and rationale. Provide links to external references/discussions if appropriate.
Resolves SR-NNNN.