wavpack: updated to 5.5.0

5.5.0:
fixed: CVE-2021-44269 (encoding crafted DSD file triggers OOB read crash)
fixed: very long filenames cause stack-overflow crash in all CLI programs
fixed: the length stored in WAV headers not always corrected when using -i
fixed: attempting to encode raw DSD audio from stdin sometimes causes crash
fixed: DSD to PCM decimation: small clicks between tracks and tiny DC offset
fixed: length update in library-generated WAV headers on big-endian machines
fixed: sanitize custom extensions read from WavPack files to be alphanumeric
added: accepting brace-delimited options in the wavpack executable filename
added: "--drop" option to Windows executables for multi-file "drag-and-drop"
added" "--raw-pcm" option to wvunpack executable (does DSD --> 24-bit PCM)
added: "--no-overwrite" option to wavpack executable (to resume sessions)
improved: build system clean-up including switch to non-recursive "make"

(adam)