mode: add stub exe

[Nikolay Sivov]

> +MODULE    = mode.exe

I don't know how important that is, but on Win7 it's called mode.com,
just what bug title says.

> @@ -3472,6 +3472,7 @@ WINE_CONFIG_PROGRAM(iexplore,,[install])
>  WINE_CONFIG_PROGRAM(ipconfig,,[clean,install])
>  WINE_CONFIG_PROGRAM(lodctr,,[install])
>  WINE_CONFIG_PROGRAM(mofcomp,,[install])
> +WINE_CONFIG_PROGRAM(mode,,[install])
>  WINE_CONFIG_PROGRAM(mshta,,[install])
>  WINE_CONFIG_PROGRAM(msiexec,,[install,installbin,manpage])
>  WINE_CONFIG_PROGRAM(net,,[clean,install])

This is not sorted.