Merged revisions 143903 via svnmerge from

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

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r143903 | seanbright | 2008-09-22 18:49:00 -0400 (Mon, 22 Sep 2008) | 8 lines

Use the advertised header size in .au files instead of just assuming they
are 24 bytes (the minimum).

(closes issue #13450)
Reported by: jamessan
Patches:
      pcm-header.diff uploaded by jamessan (license 246)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@143904 65c4cc65-6c06-0410-ace0-fbb531ad65f3