Commit 2e227c3d authored by Trevor Hickey's avatar Trevor Hickey Committed by Andreas Schuh

remove attribute where it does not apply

```
gflags.h(226): warning: attribute "visibility" does not apply here
```

The visibility attribute applies to symbols like functions and variables. A definition of an enumeration type that doesn't contain a variable name doesn't create any symbols.
parent d9b184bd
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