opusdec: Write WAV size up to 4 GiB

The WAV size fields are unsigned 32-bit integers.  Fill them in if
the size would be less than 0xffffffff; otherwise use 0xffffffff to
indicate that the chunk continues until end of file (an unofficial
convention to allow WAV files larger than 4 GiB, when no chunks
follow the audio data).
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passed #4845
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