setup.exe patch: show root dir warning only once

[Andy Koppe]

2009/9/19 Christopher Faylor:
>>* root.cc: Show warning against installing Cygwin into disk root only
>>if the root directory has actually been changed. Add orig_root_dir
>>variable for this purpose.
>>* res.rc: Make the root dir warning a bit more meaningful, and refrain
>>from shouting.
>
> Thanks for the patch.
>
> Applied with a minor ChangeLog tweak.

Thanks!