#52 Fix libiax2 unaligned errors

[Lee Howard]

Please note the libiax2 patch hung on iaxmodem's tracker:

http://sourceforge.net/tracker/index.php?func=detail&aid=2008933&group_id=148814&atid=772729

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Fix unaligned issue in libiax2 (based on a patch I found in a digium bug
report). Not sure if this is the right approach. Based on this patch:
http://bugs.digium.com/file_download.php?file_id=5353&type=bug

It got me up and running. Hopefully someone else will find it useful too!