[Cin] flac 1.5.0 is out

https://github.com/xiph/flac/releases/tag/1.5.0 should support multithreaded encode, but you need to call newly added function for that https://xiph.org/flac/api/group__porting__1__4__3__to__1__5__0.html ===== the function FLAC__stream_encoder_set_num_threads and FLAC__stream_encoder_get_num_threads have been added, which can be used to enable multithreading in the encoder =====