Cannot build wuzz with go 1.18

I cannot build wuzz with go 1.18:

```bash
$ go version
go version go1.18 darwin/amd64

$ sw_vers
ProductName: macOS
ProductVersion: 12.3
BuildVersion: 21E230
```

```
$ go install github.com/asciimoo/wuzz@latest
# golang.org/x/sys/unix
go/pkg/mod/golang.org/x/sys@v0.0.0-20200602225109-6fdc65e7d980/unix/syscall_darwin.1_13.go:29:3: //go:linkname must refer to declared function or variable
go/pkg/mod/golang.org/x/sys@v0.0.0-20200602225109-6fdc65e7d980/unix/zsyscall_darwin_amd64.1_13.go:27:3: //go:linkname must refer to declared function or variable
go/pkg/mod/golang.org/x/sys@v0.0.0-20200602225109-6fdc65e7d980/unix/zsyscall_darwin_amd64.1_13.go:40:3: //go:linkname must refer to declared function or variable
go/pkg/mod/golang.org/x/sys@v0.0.0-20200602225109-6fdc65e7d980/unix/zsyscall_darwin_amd64.go:28:3: //go:linkname must refer to declared function or variable
go/pkg/mod/golang.org/x/sys@v0.0.0-20200602225109-6fdc65e7d980/unix/zsyscall_darwin_amd64.go:43:3: //go:linkname must refer to declared function or variable
go/pkg/mod/golang.org/x/sys@v0.0.0-20200602225109-6fdc65e7d980/unix/zsyscall_darwin_amd64.go:59:3: //go:linkname must refer to declared function or variable
go/pkg/mod/golang.org/x/sys@v0.0.0-20200602225109-6fdc65e7d980/unix/zsyscall_darwin_amd64.go:75:3: //go:linkname must refer to declared function or variable
go/pkg/mod/golang.org/x/sys@v0.0.0-20200602225109-6fdc65e7d980/unix/zsyscall_darwin_amd64.go:90:3: //go:linkname must refer to declared function or variable
go/pkg/mod/golang.org/x/sys@v0.0.0-20200602225109-6fdc65e7d980/unix/zsyscall_darwin_amd64.go:105:3: //go:linkname must refer to declared function or variable
go/pkg/mod/golang.org/x/sys@v0.0.0-20200602225109-6fdc65e7d980/unix/zsyscall_darwin_amd64.go:121:3: //go:linkname must refer to declared function or variable
go/pkg/mod/golang.org/x/sys@v0.0.0-20200602225109-6fdc65e7d980/unix/zsyscall_darwin_amd64.go:121:3: too many errors
```

Start by reproducing the reported `go install github.com/asciimoo/wuzz@latest` failure with Go 1.18 on macOS, then inspect the reported golang.org/x/sys dependency. Done means wuzz builds successfully with that Go version; no project file or test is named in the report.

Written by the indexing model from the issue text.