patch applied (packages/readline): Move readline configuration into the readline package

[Simon Marlow]

Fri Jun  9 06:55:11 PDT 2006  Simon Marlow <simonmar at microsoft.com>
  * Move readline configuration into the readline package
  
  Configuration of the readline package is now done with a
  package-private configure script, which takes it a step closer to
  being a standalone Cabal package.
  
  At the same time I added --with-readline-includes and
  --with-readline-libraries options to cater for systems where these
  libraries live in non-std places.
  

    M ./Makefile -14 +25
    M ./System/Console/Readline.hsc +1
    A ./aclocal.m4
    A ./config.mk.in
    A ./configure.ac
    M ./package.conf.in -3 +3