patch applied (ghc): FIX -stubdir bug: the .hc file was #including the wrong _stub.h filename

[Simon Marlow]

Wed Sep 26 06:45:39 PDT 2007  Simon Marlow <simonmar at microsoft.com>
  * FIX -stubdir bug: the .hc file was #including the wrong _stub.h filename
  Using -stubdir together with hierarchical modules, -fvia-C, and --make
  is essentially broken in 6.6.x.  Recently discovered by Cabal's use of
  -stubdir.
  
  Test cases: driver027/driver028 (I've updated them to use -fvia-C, in
  order to test for this bug).

    M ./compiler/main/CodeOutput.lhs -3 +3
    M ./compiler/main/DriverPipeline.hs -2 +2
    M ./compiler/main/DynFlags.hs -6 +8
    M ./compiler/main/Finder.lhs -2 +16