[Tremor] ensure reasonable alignment for shorts in ivorbisfile_example.c

[Daniel Kahn Gillmor]

hi folks--

on architectures which require short (16-bit) integers to be aligned,
ivorbisfile_example.c has the potential to cause misaligned data access
due to pcmout being allocated as a buffer of chars, but accessed as a
buffer of shorts.

The attached patch fixes the problem for me.  Feel free to include it in
svn.

Regards,

	--dkg
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