This update for zstd to version 1.4.2 fixes the following issues:

Security issues fixed:

- CVE-2019-11922: Fixed race condition in one-pass compression functions that could allow out of bounds write (boo#1142941).

Non-security issues fixed:

- Added --[no-]compress-literals CLI flag to enable or disable literal compression.
- Added new --rsyncable mode.
- Added handling of -f flag to zstdgrep.
- Added CPU load indicator for each file on -vv mode.
- Changed --no-progress flag to preserve the final summary.
- Added new command --adapt for compressed network piping of data adjusted to the perceived network conditions.