wxc/setup.hs now stops searching for wxWidgets when a compatible version is found
wxc/setup.hs now stops searching for wxWidgets when a compatible version is found

This solves bug report https://sourceforge.net/p/wxhaskell/bugs/96/
(the previous solution was not correct, because filterM is too strict.)

ekmett/wxHaskell,Proclivis/wxHaskell,Proclivis/wxHaskell,sherwoodwang/wxHaskell,Proclivis/wxHaskell,sherwoodwang/wxHaskell,sherwoodwang/wxHaskell,ekmett/wxHaskell,ekmett/wxHaskell,sherwoodwang/wxHaskell,Proclivis/wxHaskell