patch applied (ghc): Don't generate Haskell dependencies if we don't have any Haskell sources

[Ian Lynagh]

Fri Jul 16 17:08:00 PDT 2010  Ian Lynagh <igloo at earth.li>
  * Don't generate Haskell dependencies if we don't have any Haskell sources

    M ./rules/build-dependencies.mk +2

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20100717000800-3fd76-eecd33c6198ae24bce450021f0b5b16046659432.gz