Merged revisions 335912 via svnmerge from

Merged revisions 335912 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/10

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  r335912 | rmudgett | 2011-09-14 13:31:15 -0500 (Wed, 14 Sep 2011) | 20 lines

  Merged revisions 335911 via svnmerge from
  https://origsvn.digium.com/svn/asterisk/branches/1.8

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    r335911 | rmudgett | 2011-09-14 13:21:35 -0500 (Wed, 14 Sep 2011) | 13 lines

    Remove unnecessary libpri dependency checks in the configure script.

    Using the --with-pri option with the configure script generated an error
    about not having PRI_L2_PERSISTENCE if you did not have the absolute
    latest libpri SVN checkout installed.

    The AST_EXT_LIB_SETUP_DEPENDENT macro in the configure.ac script seems to
    be for libraries that are dependent upon other libraries and not
    necessarily for optional/added features within a library.

    (closes issue ASTERISK-18535)
    Reported by: Michael Keuter
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@335913 65c4cc65-6c06-0410-ace0-fbb531ad65f3