[VOL-4293] OpenONU Adapter update for gRPC migration

Change-Id: I05300d3b95b878f44576a99a05f53f52fdc0cda1
diff --git a/vendor/golang.org/x/sys/unix/cap_freebsd.go b/vendor/golang.org/x/sys/unix/cap_freebsd.go
index df52048..0b7c6ad 100644
--- a/vendor/golang.org/x/sys/unix/cap_freebsd.go
+++ b/vendor/golang.org/x/sys/unix/cap_freebsd.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build freebsd
 // +build freebsd
 
 package unix