rpm migrate_tempdirs() problem on SuSE

[Ken McDonell <kenj@xxxxxxxxxxxxxxxx>]

The rpm spec files both contain

        mv -fun "$source" "$target"

on SuSE, mv(1) has no -n option (nor the equivalent --no-clobber) ... 
need some recoding here in old-style portable Unix command speak I think 
... I'll leave that to someone who understands what this was supposed to 
be doing.
I'm guessing it needs to be

        [ -d "$target" ] || mv -fu "$source" "$target"

if "$target" is always a directory in this context