patch applied (packages/readline): remove obsolete config.mk.in

[Ross Paterson]

Tue Nov  6 16:58:50 PST 2007  Ross Paterson <ross at soi.city.ac.uk>
  * remove obsolete config.mk.in
  
  This was used when building in the GHC tree using the old fptools build
  system, to pass parameters from configure to the Makefile.  With the new
  Cabal-based build system, they go via readline.buildinfo.

    R ./config.mk.in
    M ./configure.ac -5 +1
    M ./readline.cabal -1 +1