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).
parent 8f56cc62
Pipeline #1358 passed with stage
in 1 minute and 4 seconds