v1.5.1

Zstandard v1.5.1 Release

Note that a different commit was very briefly tagged as `v1.5.1`, before we
realized it was incomplete. That commit, f4a541b0, and this commit, 791626df
are functionally equivalent. In the unlikely event that you caught this tag
pointing to that commit, do not be alarmed, and sorry for the churn.
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