patch applied (cabal): Change --configure-option= to --configure-arg=

[Ross Paterson]

On Sat, Sep 01, 2007 at 05:33:26PM -0700, Duncan Coutts wrote:
> Sat Sep  1 17:33:34 PDT 2007  Duncan Coutts <duncan at haskell.org>
>   * Change --configure-option= to --configure-arg=
>   For consitency with other flags.

Also --ghc-option for build and makefile.  These are used by GHC only;
I wonder if the configure option would be a substitute.

I forgot that the file format includes XXX-options fields, which might
be a source of confusion.