darcs patch: Added flags related to UHC, uhcbase package (and 1 more)

2 patches for repository http://darcs.haskell.org/cabal: Tue Jul 6 07:53:41 EDT 2010 Atze Dijkstra * Added flags related to UHC, uhcbase package Thu Sep 23 17:41:30 EDT 2010 Atze Dijkstra * initial support for building executables with UHC