patch applied (cabal): "Add a deprecated knownExtensions for better backwards compatability"

[Duncan Coutts]

Tue May 17 15:43:27 PDT 2011  Duncan Coutts <duncan at community.haskell.org>
  * Add a deprecated knownExtensions for better backwards compatability
  As suggested by Hamish Mackenzie

    M ./Language/Haskell/Extension.hs -1 +7

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=cabal;a=darcs_commitdiff;h=20110517224327-5c91e-3c4d04e7edca4540b8e46cbcb0b01f90f2bcb042.gz