Merged revisions 208542 via svnmerge from

Merged revisions 208542 via svnmerge from
https://origsvn.digium.com/svn/asterisk/trunk

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  r208542 | mvanbaak | 2009-07-24 16:35:49 +0200 (Fri, 24 Jul 2009) | 13 lines

  use aptitude for debian based systems

  The function to check wether we need to install packages was using
  dpkg-query which was gives wrong output on Debian 5

  Also, the apt-get has been replaced with aptitude because aptitude
  is now the preferred way to handle packages on Debian

  (closes issue #15570)
  Reported by: mvanbaak
  Patches:
        2009072400_installprereq-aptitude.diff uploaded by mvanbaak (license 7)
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