patch applied (ghc): Simpler, more self-contained, " make dist"

[Simon Marlow]

Mon Feb  5 06:07:27 PST 2007  Simon Marlow <simonmar at microsoft.com>
  * Simpler, more self-contained, "make dist"
  This version does all its work in a subdirectory (no more destructive
  'make distclean' in the current build tree), and results in the exact
  -src.tar.bz2 distributions that we will put up for download.

    M ./Makefile -31 +28