added `ihaskell install` into build.sh
added `ihaskell install` into build.sh

wyager/IHaskell,artuuge/IHaskell,qzchenwl/IHaskell,gibiansky/IHaskell,kfiz/IHaskell,kfiz/IHaskell,beni55/IHaskell,sumitsahrawat/IHaskell,thomasjm/IHaskell,qzchenwl/IHaskell,artuuge/IHaskell,thomasjm/IHaskell,sumitsahrawat/IHaskell,qzchenwl/IHaskell,artuuge/IHaskell,kfiz/IHaskell,FranklinChen/IHaskell,gibiansky/IHaskell,franklx/IHaskell,artuuge/IHaskell,kfiz/IHaskell,FranklinChen/IHaskell,beni55/IHaskell,qzchenwl/IHaskell,thomasjm/IHaskell,FranklinChen/IHaskell,beni55/IHaskell,gibiansky/IHaskell,wyager/IHaskell,franklx/IHaskell,FranklinChen/IHaskell,thomasjm/IHaskell,franklx/IHaskell,franklx/IHaskell,beni55/IHaskell,wyager/IHaskell,sumitsahrawat/IHaskell,wyager/IHaskell