`foreign export` block

```
foreign export {
    my_i32: i32;
    my_foo :: proc() -> i32 {
        return 123;
    }
}
```

1 files changed, 1 insertions, 0 deletions

diff --git a/src/entity.cpp b/src/entity.cpp
index b4ffc300b..68985e051 100644
--- a/src/entity.cpp
+++ b/src/entity.cpp
@@ -46,6 +46,7 @@ enum EntityFlag {
 
 	EntityFlag_CVarArg       = 1<<20,
 
+	EntityFlag_ForeignExport = 1<<23,
 };
 
 // Zero value means the overloading process is not yet done