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- update to 1.5.6:
  * Introduce a new stable parameter ZSTD_c_targetCBlockSize, 
    enabling the division of blocks into smaller segments to
    enhance initial byte delivery speed for congested networks
  * library allows allow ganular binary size selection
- drop zstd-pr-3961.patch, merged upstream

- Backport PAC/BTI fix for aarch64 
  https://github.com/facebook/zstd/pull/3961 :
  * zstd-pr-3961.patch

- Disable build of gzip for Leap 15.x to fix build error.
  * Dropped patches:
    - Disallow-empty-output-directory.patch
    - Fix-buffer-underflow-for-null-dir1.patch
    Fixed upstream

- Fix CVE-2022-4899, bsc#1209533
 * Fix buffer underflow when dir1 == ""
 * Disallow empty string as an argument for --output-dir-flat=""
   and --output-dir-mirror="".
- Added patches:
 * Disallow-empty-output-directory.patch
 * Fix-buffer-underflow-for-null-dir1.patch

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- Revert the addition of build specific cmake files: breaks
  gdal, apache-arrow and possibly others -- boo#1211566
  * note that shipping cmake files is not intentional or supported
    upstream at the moment: gh#facebook/zstd#3642

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- Add cmake files manually because we do not want to add
  cmake to the bootstrap ring0

- update to 1.5.5:
  * fix: fix rare corruption bug affecting the high compression
    mode, reported by @danlark1
  * perf: improve mid-level compression speed
  * lib: deprecated bufferless block-level API (#3534) by
    @terrelln
  * cli: mmap large dictionaries to save memory, by
    @daniellerozenblit
  * cli: improve speed of --patch-from mode (~+50%) (#3545) by
    @daniellerozenblit
  * cli: improve i/o speed (~+10%) when processing lots of small
    files (#3479) by @felixhandte
  * cli: zstd no longer crashes when requested to write into
    write-protected directory (#3541) by @felixhandte
  * cli: fix decompression into block device using -o, reported
    by @georgmu
  * misc: improve seekable format ingestion speed (~+100%) for
    very small chunk sizes (#3544) by @Cyan4973
  * misc: tests/fullbench can benchmark multiple files (#3516) by
    @dloidolt

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- update to 1.5.4:
  * perf: +20% faster huffman decompression for targets that
    can't compile x64 assembly
  * perf: up to +10% faster streaming compression at levels 1-2
  * perf: +4-13% for levels 5-12 by optimizing function
    generation
  * pref: +3-11% compression speed for `arm` target
  * perf: +5-30% faster dictionary compression at levels 1-4
  * perf: +10-20% cold dict compression speed by prefetching
    CDict tables
  * perf: +1% faster compression by removing a branch in
    ZSTD_fast_noDict
  * perf: Small compression ratio improvements in high
    compression mode
  * perf: small speed improvement by better detecting
    `STATIC_BMI2` for `clang`
  * perf: Improved streaming performance when
    `ZSTD_c_stableInBuffer` is set
  * cli: Asynchronous I/O for improved cli speed
  * cli: Change `zstdless` behavior to align with `zless`
  * cli: Keep original file if `-c` or `--stdout` is given
  * cli: Keep original files when result is concatenated into a
    single output with `-o`
  * cli: Preserve Permissions and Ownership of regular files
  * cli: Print zlib/lz4/lzma library versions with `-vv`
  * cli: Print checksum value for single frame files with `-lv`
  * cli: Print `dictID` when present with `-lv`
  * cli: when `stderr` is *not* the console, disable status
    updates, but preserve final summary
  * cli: support `--best` and `--no-name` in `gzip` compatibility

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