patch applied (ghc): always try to remove the new file before restoring the old one (#1963)

[Simon Marlow]

Fri Dec 14 04:33:45 PST 2007  Simon Marlow <simonmar at microsoft.com>
  * always try to remove the new file before restoring the old one (#1963)

    M ./utils/ghc-pkg/Main.hs -7 +6