Merged revisions 68814 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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r68814 | qwell | 2007-06-11 16:20:15 -0500 (Mon, 11 Jun 2007) | 2 lines

Solaris 10 sometimes (?) needs this include in order to have NULL defined.

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@68816 65c4cc65-6c06-0410-ace0-fbb531ad65f3