Log Message:
devel/hs-libffi: Update to 0.2.1

0.2.1 [2022.09.24]
* Add sizeAndAlignmentOfCType to Foreign.LibFFI.Base, which can be used to
  retrieve the size and alignment of a CType.

0.2 [2022.08.11]
* The libffi library now uses bracket internally and should now be
  exception-safe.
* There is a now a ghc-bundled-libffi cabal flag that makes this library
  statically link against GHC's bundled copy of libffi rather than attempt
  to link against the system libffi. On the vast majority of GHCs, this is
  the most reasonable option, as linking against the system libffi is
  inherently fragile. As a result, +ghc-bundled-libffi is now the defalut
  setting. See the README for more discussion on this point.
* The definition of Arg has changed:
    -newtype Arg = Arg { unArg :: IO (Ptr CType, Ptr CValue, IO ()) }
    +newtype Arg = Arg { unArg :: forall a. (Ptr CType -> Ptr CValue -> IO \ 
a) -> IO a }
* The definition of RetType has changed:
    -data RetType a = RetType (Ptr CType) ((Ptr CValue -> IO ()) -> IO a)
    +newtype RetType a = RetType { unRetType :: (Ptr CType -> Ptr CValue \ 
-> IO ()) -> IO a }