fix: delete unused macro

ofborg/src/stats.rs

@@ -7,12 +7,6 @@ mod events {
 }
 pub use events::*;
 
-#[macro_use]
-mod macros {
-    #[macro_export]
-    macro_rules! my_macro(() => (FooBar));
-}
-
 #[async_trait]
 pub trait SysEvents: Send {
     async fn notify(&mut self, event: Event);