Merged revisions 74970 via svnmerge from

Merged revisions 74970 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r74970 | ronald.oussoren | 2009-09-20 16:18:15 +0200 (Sun, 20 Sep 2009) | 7 lines

  Issue 6877: this patch makes it possible to link the readline extension
  to the libedit emulation of the readline API on OSX 10.5 or later.

  This also adds a minimal testsuite for readline to check that the
  history manipuation functions have the same interface with both
  C libraries.
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