v1.3.3
[zstd] Backport kernel patch from @ColinIanKing
Ensure dictionary Huff table can encode any symbol
Merge pull request #958 from facebook/continueCCtx
fix #944 : ZSTDMT with large files and dictionary now works correctly
renamed zstd_compress.h into zstd_compress_internal.h
strategy ZSTD_btopt pinned to (0) variant (faster one)
Increase maximum window size
zstd_opt: added comments, as requested by @terrelln
zstdmt via compress_generic: reduce opportunity to free/create mtctx