Mostly error and warning fixes.#92

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Jonathan-Weinstein-AMD:fixes

Commits on Mar 19, 2026

zstd: Return on unknown arg. Coded in probably not the best way to reduce potential merge conflicts.
Jonathan-Weinstein-AMD
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zstd: Fix symbol to use _SingleStream. PR #91 seems to have been based on a branch that didn't have PR #90.
Jonathan-Weinstein-AMD
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zstd: Fix warnings. The `volatile` is unusual, but I figured there was value in keeping `const[-expr]` and not having to change multiple `if`s to `if constexpr`.
Jonathan-Weinstein-AMD
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