lib.systems: fix path to wine executable (#489196)

            if pkgs.stdenv.hostPlatform.canExecute final then

              lib.getExe (pkgs.writeShellScriptBin "exec" ''exec "$@"'')

            else if final.isWindows then

              "${wine}/bin/wine${optionalString (final.parsed.cpu.bits == 64) "64"}"

              "${wine}/bin/wine"

            else if final.isLinux && pkgs.stdenv.hostPlatform.isLinux && final.qemuArch != null then

              "${pkgs.qemu-user}/bin/qemu-${final.qemuArch}"

            else if final.isWasi then