Fix compilation of MySQL & Redshift plugins (#10640)

plugins/database/mysql/mysql-legacy-database-plugin/main.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/hashicorp/vault/plugins/database/mysql"
 	dbplugin "github.com/hashicorp/vault/sdk/database/dbplugin/v5"
+	"github.com/hashicorp/vault/sdk/database/helper/credsutil"
 )
 
 func main() {
@@ -19,7 +20,7 @@ func main() {
 // Run instantiates a MySQL object, and runs the RPC server for the plugin
 func Run() error {
 	var f func() (interface{}, error)
-	f = mysql.New(true)
+	f = mysql.New(credsutil.NoneLength, mysql.LegacyMetadataLen, mysql.LegacyUsernameLen)
 	dbType, err := f()
 	if err != nil {
 		return err