no more compiler error if tags are missing, message instead

Author: ldemailly

tags.go

@@ -5,14 +5,15 @@
 
 package main
 
-// cause an error on purpose if not built with correct tags:
-var _ = `
-##############
+import "fmt"
 
+// Indicate proper install if tags were missing or cgo is used.
+func init() {
+	fmt.Println(`##############
 INSTALL/BUILD ERROR: this file should not be built with cgo or without no_net or no_json tags, please re
 install using
 
 CGO_ENABLED=0 go install -trimpath -ldflags="-w -s" -tags no_net,no_json grol.io/grol@latest
 
-##############
-`.(int)
+##############`)
+}