bug#6674: PATCH: fix assignment of grep-find-use-xargs on Windows

[Eli Zaretskii]

> Date: Tue, 20 Jul 2010 18:44:55 -0600
> From: Christoph <cschol2112@googlemail.com>
> CC: Eli Zaretskii <eliz@gnu.org>, Juanma Barranquero <lekktu@gmail.com>, 
>  Óscar Fuentes <ofv@wanadoo.es>
> 
> If nobody else is already working on it, I'd want to give it a try to 
> fix this. Either by enhancing cmdproxy or implementing Eli's batch file 
> solution.

Thanks.  To make my intent clear: I meant to enhance cmdproxy to use a
batch file when invoking the windows shell.  You will see that there's
a variable need_shell in cmdproxy's `main' function which gets set to
a non-zero value when cmdproxy decides it needs to pass the command
the the shell instead of invoking it directly.  What I suggested is to
modify the code in this case to put the command on a temporary batch
file, then invoke the shell on that batch file rather than on the
command itself.