patch applied (cabal-install): Add install --log-builds flag

[Duncan Coutts]

Wed Jul 30 11:33:44 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Add install --log-builds flag
  Eg can use cabal install foo --log-builds='$pkgid-$compiler.log'
  and the build log for each package will written to a separate
  file. If an existing file is given then the log is appended.
  This or something like it should help in future with build
  reporting of the non-anonymous kind.

    M ./Distribution/Client/Install.hs -6 +28
    M ./Distribution/Client/Setup.hs -3 +12

View patch online:
http://darcs.haskell.org/cabal-install/_darcs/patches/20080730183344-adfee-7a038a8a335fab128db71cdf149c35beb192b972.gz