patch applied (ghc): Make the integer library to use more configurable

[Ian Lynagh]

Sun Apr 20 12:58:56 PDT 2008  Ian Lynagh <igloo at earth.li>
  * Make the integer library to use more configurable
  Now you just set INTEGER_LIBRARY=integer-foo in build.mk

    M ./libraries/Makefile -3 +4
    M ./mk/config.mk.in +3

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20080420195856-3fd76-d72878c9680336e646c894cdaff9fdbd4ea22b33.gz