patch applied (packages/Cabal): Fix bug where we'd try to configure an empty set of pkg-config packages

[Ian Lynagh]

Sat Nov  1 12:55:12 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Fix bug where we'd try to configure an empty set of pkg-config packages
  This happened when the lib used pkg-config but the exe did not.
  It cropped up in hsSqlite3-0.0.5.

    M ./Distribution/Simple/Configure.hs -2 +3

View patch online:
http://darcs.haskell.org/packages/Cabal/_darcs/patches/20081101195512-adfee-0233e9fafd26185d6add48077f76ade12c92fece.gz