Hid Data.Typeable.Proxy export to satsify build

Fixed this
```haskell
src/Data/SafeCopy/Instances.hs:379:31:
    Ambiguous occurrence ‘Proxy’
    It could refer to either ‘Data.SafeCopy.SafeCopy.Proxy’,
                             imported from ‘Data.SafeCopy.SafeCopy’ at src/Data/SafeCopy/Instances.hs:5:1-29
                             (and originally defined at src/Data/SafeCopy/SafeCopy.hs:391:1-20)
                          or ‘Data.Typeable.Proxy’,
                             imported from ‘Data.Typeable’ at src/Data/SafeCopy/Instances.hs:34:1-30
                             (and originally defined in ‘Data.Proxy’)
```