patch applied (ghc-6.12/ghc): Add the external core PDF to the new build system

[Ian Lynagh]

Sun Mar 21 09:19:09 PDT 2010  Ian Lynagh <igloo at earth.li>
  * Add the external core PDF to the new build system

    M ./docs/ext-core/Makefile -61 +2
    A ./docs/ext-core/ghc.mk
    M ./docs/users_guide/using.xml -1 +1
    M ./ghc.mk +1
    M ./mk/config.mk.in +2