patch applied (packages/Cabal): Add initial support for --enable/disable-library-vanilla flags

[Duncan Coutts]

Thu Jul 20 10:44:08 PDT 2006  jeremy.shaw at linspireinc.com
  * Add initial support for --enable/disable-library-vanilla flags
  For additional information see these mail threads:
  
  http://www.haskell.org//pipermail/libraries/2006-July/005522.html
  http://urchin.earth.li/pipermail/debian-haskell/2006-July/000220.html

    M ./Distribution/Setup.hs +9
    M ./Distribution/Simple/Configure.hs +1
    M ./Distribution/Simple/GHC.hs -10 +20
    M ./Distribution/Simple/Install.hs -1 +1
    M ./Distribution/Simple/LocalBuildInfo.hs +1