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

2 patches for repository http://darcs.haskell.org/cabal: Tue Jul 6 13:53:41 CEST 2010 Atze Dijkstra * Added flags related to UHC, uhcbase package Thu Sep 23 23:41:30 CEST 2010 Atze Dijkstra * initial support for building executables with UHC