x/crypto/blake2s: unrecognized failures [consistent failure]

```
#!watchflakes
default <- pkg == "golang.org/x/crypto/blake2s" && test == ""
```

Issue created automatically to collect these failures.

Example ([log](https://ci.chromium.org/b/8717852283080693105)):

    FAIL	golang.org/x/crypto/blake2s [build failed]


— [watchflakes](https://go.dev/wiki/Watchflakes)
