ext/userfunc: update stale references to "zcl"
ext/userfunc: update stale references to "zcl"

hashicorp/hcl,strivecast/hcl,hashicorp/hcl,strivecast/hcl,hashicorp/hcl,hashicorp/hcl,strivecast/hcl,strivecast/hcl,strivecast/hcl,hashicorp/hcl