patch applied (cabal): Warn if C dependencies not found (kind of fixes #262)

[Duncan Coutts]

Mon Jan 26 10:58:32 PST 2009  gleb.alexeev at gmail.com
  * Warn if C dependencies not found (kind of fixes #262)
  
  This is just a basic check - generate a sample program and check if it compiles and links with relevant flags. Error messages (warning messages, 
  actually) could use some improvement.

    M ./Distribution/Simple/Configure.hs -5 +44

View patch online:
http://darcs.haskell.org/cabal/_darcs/patches/20090126185832-93f71-3223821199c44f405a669e847d9319c9b156a13b.gz