[MERGE] avoids preexec_fn on win32

[John Arbash Meinel]

Alexander Belchenko wrote:
...

> After successfully applying your bundle to bzr.dev revno.1986 I got the
> same error with preexec_fn.
> 
> -- 
> Alexander

I assume you only got those errors in the diff tests, and not in all the
rest of the tests. (You may have also gotten that error in some of the
gpg tests).

The attached patch should clean up the all of the cases where I wanted
to use preexec_fn. In general, where we were using it, it was to clean
up environment variables, which wouldn't be useful anyway on win32.

I tested it on a windows machine, and tests that used preexec_fn seem to
be passing now. (I still have problems with \r\n versus plain \n, but
the rest seem okay).

I'm putting together a patch to handle the $HOME issues, since we want
that fixed anyway. Which should fix all of the _set_user_ignores failures.

John
=:->
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