patch applied (packages/Cabal): Improve the warning message about unsupported extensions.

[Ian Lynagh]

Mon Mar 24 12:14:21 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Improve the warning message about unsupported extensions.
  That is, extensions the compiler does not support, as opposed to
  extensions that are unknown to Cabal.

    M ./Distribution/Simple/Configure.hs -1 +1

View patch online:
http://darcs.haskell.org/packages/Cabal/_darcs/patches/20080324191421-adfee-08a7a7e3eabd0e554189e853fcda618ff86d27c1.gz