patch applied (ghc): Add a -fbuilding-cabal-package flag

[Ian Lynagh]

Sun Jul 26 11:19:34 PDT 2009  Ian Lynagh <igloo at earth.li>
  * Add a -fbuilding-cabal-package flag
  This means GHC knows whether it's building a Cabal package, or just
  Haskell sources. For example, it may wish to give different error
  messages when building a Cabal package.

    M ./compiler/main/DynFlags.hs +2

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20090726181934-3fd76-910716877beb1b3d90784fbf391ec5f2b984ec6b.gz