patch applied (cabal): a couple of fixes to ' setup makefile'

[Simon Marlow]

Mon Apr 16 06:33:07 PDT 2007  Simon Marlow <simonmar at microsoft.com>
  * a couple of fixes to 'setup makefile'
  Put the -package-name flag at the beginning of GHC_OPTS, allowing it
  to be overriden later (as we do in the base package, for example).
  Also, add -split-objs if necessary.

    M ./Distribution/Simple/GHC.hs -2 +5