darcs patch: Don't test for rl_completion_word_break_hook with -lreadline if we're using GNUreadline.framework.

[Judah Jacobson]

Looking over some buildbot logs, I realized the following issue with
the readline configure script: It always adds an extra -lreadline when
checking for rl_completion_word_break_hook, despite the fact that
sometimes we want to link with -framework GNUreadline.

Thanks,
-Judah


  * Don't test for rl_completion_word_break_hook with -lreadline if
we're using GNUreadline.framework.

    M ./configure.ac -2 +2
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