patch applied (haddock2): Tidy up haddock symlink installation

[Ian Lynagh]

Thu Sep 30 10:03:34 PDT 2010  Ian Lynagh <igloo at earth.li>
  * Tidy up haddock symlink installation
  In particular, it now doesn't get created if we aren't installing
  haddock.

    M ./ghc.mk -5 +5

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=haddock2;a=darcs_commitdiff;h=20100930170334-3fd76-c4414ae0cf1ad08c98dd6248ab5fdf00151d744f.gz