Code review comment for lp:~vila/bzr-gtk/388790-windows-setup

This is a cleaned up version of the patch proposed in https://bugs.edge.launchpad.net/bzr/+bug/388790.

Guilhem, can you test it again on the two cited envs (Vladislav's and yours) and report here.

Bialix, can you comment again about the validity of the approach (the path needs to be tweaked for bzr.exe *only*) ?

If no bzr-gtk dev objects, I'll land this patch as soon as I get confirmation from both of you plus a little delay (for objections).