Proposal: add Data.Data instances for Foreign.C.Types

[Ryan Newton]

I recently was wanting to use SYB for an AST datatype which includes
constants like CDouble/CFloat.  Currently Data.Data exports Int8...Int64
and Word instances, but no instances for Foreign.C.Types:

   http://www.haskell.org/ghc/docs/latest/html/libraries/base/Data-Data.html

Is there any reason these instances should not be exported by Data.Data?
 The proposal here is simply to add them.  It's  just a matter of
copy-pasting the existing instances and I can provide the patch.

  -Ryan
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