Update dependencies

vendor/golang.org/x/net/lif/link_test.go

@@ -21,15 +21,17 @@ type linkPack struct {
 }
 
 func linkPacks() ([]linkPack, error) {
+	var lastErr error
 	var lps []linkPack
 	for _, af := range [...]int{sysAF_UNSPEC, sysAF_INET, sysAF_INET6} {
 		lls, err := Links(af, "")
 		if err != nil {
-			return nil, err
+			lastErr = err
+			continue
 		}
 		lps = append(lps, linkPack{af: af, lls: lls})
 	}
-	return lps, nil
+	return lps, lastErr
 }
 
 func TestLinks(t *testing.T) {