x/crypto/argon2: unrecognized failures

```
#!watchflakes
default <- pkg == "golang.org/x/crypto/argon2" && test == ""
```

Issue created automatically to collect these failures.

Example ([log](https://ci.chromium.org/b/8717645589401701937)):

    FAIL	golang.org/x/crypto/argon2 [build failed]


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