patch applied (cabal): revise Paths module for the Hugs target

[Ross Paterson]

Wed Nov  8 14:33:49 PST 2006  Ross Paterson <ross at soi.city.ac.uk>
  * revise Paths module for the Hugs target
  
  When targetting Hugs, the Paths module now uses prefix-independent
  paths relative to the location of the Main module of the program,
  on all platforms.
  
  For the Hugs target, this replaces the code using GetModuleFileNameA(),
  which never worked.  Behaviour under GHC should be unchanged.

    M ./Distribution/Simple/Build.hs -19 +46
    M ./Distribution/Simple/LocalBuildInfo.hs -3 +8
    M ./doc/Cabal.xml -4 +4