disable cgo for cli only build

bridge/bridge.go

@@ -1,3 +1,4 @@
+// +build cgo
 package bridge
 
 // #include "stdint.h"

bridge/bridge_stub.go

@@ -0,0 +1,11 @@
+//go:build !cgo
+// +build !cgo
+
+package bridge
+
+import "unsafe"
+
+func InitializeDartApi(api unsafe.Pointer) {
+}
+func SendStringToPort(port int64, msg string) {
+}