nexgb: export {Major,Minor}Version for extensions

nexgb/xf86vidmode/xf86vidmode.go

@@ -9,6 +9,11 @@ import (
 	"janouch.name/haven/nexgb/xproto"
 )
 
+const (
+	MajorVersion = 2
+	MinorVersion = 2
+)
+
 // Init must be called before using the XFree86-VidModeExtension extension.
 func Init(c *xgb.Conn) error {
 	reply, err := xproto.QueryExtension(c, 24, "XFree86-VidModeExtension").Reply()