fix abi3 tests

Author: bschoenmaeckers

pyo3-ffi/src/compat/mod.rs

@@ -42,6 +42,7 @@ macro_rules! compat_function {
                 use $crate::compat::*;
 
                 #[test]
+                $(#[$attrs])*
                 fn test_export() {
                     let _ = $name;
                 }