Replace _wcsdup with wxStrdup in wxWidgets 2.8 compat code.
Replace _wcsdup with wxStrdup in wxWidgets 2.8 compat code.

According to shelarcy and Jeremy, _wcsdup is Windows-specific.

darcs-hash:20080420115042-db91e-cca7791daaa5db3bd8ab385c922e00f007f284a3.gz

Proclivis/wxHaskell,thielema/wxhaskell,Proclivis/wxHaskell,ekmett/wxHaskell,Proclivis/wxHaskell,sherwoodwang/wxHaskell,thielema/wxhaskell,Proclivis/wxHaskell,ekmett/wxHaskell,sherwoodwang/wxHaskell,sherwoodwang/wxHaskell,thielema/wxhaskell,sherwoodwang/wxHaskell,ekmett/wxHaskell,thielema/wxhaskell