Get chan_ooh323 to compile with gcc 4.2.

For some reason, the code compiles just fine with later versions
of GCC, but this one requires some weird double casting in order
to get rid of all warnings. Whatever.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@228658 65c4cc65-6c06-0410-ace0-fbb531ad65f3