patch applied (cabal): Fix Show/Read for License

[Ian Lynagh]

Fri Dec 12 10:36:22 PST 2008  Ian Lynagh <igloo at earth.li>
  * Fix Show/Read for License
  We were ending up with things like
      InstalledPackageInfo {
          ...
          license = LGPL Nothing,
          ...
      }
  i.e. "LGPL Nothing" rather than "LGPL", which we couldn't then read.

    M ./Distribution/License.hs -2 +14

View patch online:
http://darcs.haskell.org/cabal/_darcs/patches/20081212183622-3fd76-d1f63fdfce7bfca55bdf132c3758f2da8fb403cc.gz