HLint doesn't report "Unused LANGUAGE pragma"

File contains just:
```hs
{-# LANGUAGE BangPatterns #-}
```
HLS reports no warnings. HLint 3.2.7 on the command line says:

```
haskell/Main.hs:1:1-29: Warning: Unused LANGUAGE pragma
Found:
  {-# LANGUAGE BangPatterns #-}
Perhaps you should remove it.
```

Odd. Is HLS intentionally disabling these hints for some reason?