Add older style build comment

To compatible with older Go version on some cloud environment , such as Google App Engine using 1.16
4 years ago · a263a9f173
1 changed files with 2 additions and 1 deletions
--- a/sockopts_other.go
+++ b/sockopts_other.go
@ -1,4 +1,5 @@
 //go:build !linux
+// +build !linux

 package gost