patch applied (packages/Cabal): Don't complain if there is no ghc rts package registered

[Ian Lynagh]

Tue Oct  6 10:26:18 PDT 2009  Duncan Coutts <duncan at haskell.org>
  * Don't complain if there is no ghc rts package registered
  Ignore-this: 8634380cb75891a13988123bbbfd372b

    M ./Distribution/Simple/GHC.hs -1 +2

View patch online:
http://darcs.haskell.org/packages/Cabal/_darcs/patches/20091006172618-adfee-fae686abf9bb640c16c0afa1cd1de59fb6aabd56.gz