patch applied (ghc): fix it so that 'make' on its own works even if we're not building docs

[Simon Marlow]

Thu May 28 04:16:08 PDT 2009  Simon Marlow <marlowsd at gmail.com>
  * fix it so that 'make' on its own works even if we're not building docs
  Ignore-this: 92e9355de04733042403dc6814a3a146

    M ./rules/docbook.mk +3

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20090528111608-12142-dfc7a1a512ae9406794c23c0ebc4cf5e97d33206.gz