patch applied (ghc): Don't rebuild things with the stage2 compiler

[Manuel M T Chakravarty]

Ian Lynagh:
> Sun Jun 22 06:46:13 PDT 2008  Ian Lynagh <igloo at earth.li>
>  * Don't rebuild things with the stage2 compiler
>  It leads to annoying rebuilding when working in a built tree.
>  We'll handle this differently for 6.10.

How do you want to handle this?  (This patch essentially breaks  
building the Mac installer.)

Manuel