[cvs-nhc98] patch applied (hat): Change ghc version detection code yet again.

[Malcolm Wallace]

Tue May 29 03:13:55 PDT 2007  Malcolm.Wallace at cs.york.ac.uk
  * Change ghc version detection code yet again.
  This will probably the most reliable method of all time: cpp, compile
  and run a program to print __GLASGOW_HASKELL__.  Now why didn't I think
  of that ten years ago?  Thanks Igloo.

    M ./script/confhc-hat -4 +4