[opus] opusfile Include fix

[Alexander Panchenko]

Hi all!
When compiling the program using opusfile the

#include <opus/opusfile.h>

generates error that

# include <opus_multistream.h>

is not found. Actually it should be included as

# include <opus/opus_multistream.h>

just like the ogg.h in the previous line.

A small patch attached.

-- 
Best regards,
Alexander

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