patch applied (cabal): Improve the error message for missing foreign libs and make it fatal

[Duncan Coutts]

Sat Jan 31 10:48:13 PST 2009  Duncan Coutts <duncan at haskell.org>
  * Improve the error message for missing foreign libs and make it fatal
  The check should now be accurate enough that we can make it an
  error rather than just a warning.

    M ./Distribution/Simple/Configure.hs -8 +28

View patch online:
http://darcs.haskell.org/cabal/_darcs/patches/20090131184813-adfee-55b6a46f0b89cbc206c16ef39bc28d2a253dee5e.gz