patch applied (cabal): Only print message about ignoring -threaded if its actually present

[Duncan Coutts]

Fri Feb  6 09:47:07 PST 2009  Duncan Coutts <duncan at haskell.org>
  * Only print message about ignoring -threaded if its actually present

    M ./Distribution/Simple/GHC.hs -4 +5

View patch online:
http://darcs.haskell.org/cabal/_darcs/patches/20090206174707-adfee-5ad5e7e41f34d202b06212b86dab88a1efc5e909.gz