ac04d9f Revert "Disable -warn-error."

Authored and Committed by rjones 6 years ago
    Revert "Disable -warn-error."
    
    Accidentally added to ocaml-lablgtk instead of ocaml-labltk.
    
    This reverts commit 63be399c8e3cf5773c79c138469c428acf9054bb.
    
        
file modified
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