patch applied (cabal): Move build-tools into the lib/exe stanzas and update configure

[Duncan Coutts]

Fri Aug 31 07:40:01 PDT 2007  Duncan Coutts <duncan at haskell.org>
  * Move build-tools into the lib/exe stanzas and update configure
  configure now has to gather the required build tools from the BuildInfo
  of the lib and exes.

    M ./Distribution/PackageDescription.hs -6 +6
    M ./Distribution/Simple/Configure.hs -7 +6