Add option to build rosettax87 locally (#9)

Reviewed-on: #9

pkg/ui/variables.go

@@ -61,6 +61,7 @@ var (
 	crossoverVersionStatusLabel *widget.RichText
 	wdbDeleteButton             *widget.Button
 	wineDeleteButton            *widget.Button
+	buildRosettaButton          *widget.Button
 	appMgmtPermissionButton     *widget.Button
 	troubleshootingCloseButton  *widget.Button
 )