Log Message:
zstd: Update to 1.4.9

Changelog:
    bug: Use umask() to Constrain Created File Permissions (#2495, @felixhandte)
    bug: Make Simple Single-Pass Functions Ignore Advanced Parameters (#2498, \ 
@terrelln)
    api: Add (De)Compression Tracing Functionality (#2482, @terrelln)
    api: Support References to Multiple DDicts (#2446, @senhuang42)
    api: Add Function to Generate Skippable Frame (#2439, @senhuang42)
    perf: New Algorithms for the Long Distance Matcher (#2483, @mpu)
    perf: Performance Improvements for Long Distance Matcher (#2464, @mpu)
    perf: Don't Shrink Window Log when Streaming with a Dictionary (#2451, @terrelln)
    cli: Fix --output-dir-mirror's Rejection of ..-Containing Paths (#2512, \ 
@felixhandte)
    cli: Allow Input From Console When -f/--force is Passed (#2466, @felixhandte)
    cli: Improve Help Message (#2500, @senhuang42)
    tests: Avoid Using stat -c on NetBSD (#2513, @felixhandte)
    tests: Correctly Invoke md5 Utility on NetBSD (#2492, @niacat)
    tests: Remove Flaky Tests (#2455, #2486, #2445, @Cyan4973)
    build: Zstd CLI Can Now be Linked to Dynamic libzstd (#2457, #2454 @Cyan4973)
    build: Avoid Using Static-Only Symbols (#2504, @skitt)
    build: Fix Fuzzer Compiler Detection & Update UBSAN Flags (#2503, @terrelln)
    build: Explicitly Hide Static Symbols (#2501, @skitt)
    build: CMake: Enable Only C for lib/ and programs/ Projects (#2498, @concatime)
    build: CMake: Use configure_file() to Create the .pc File (#2462, @lazka)
    build: Add Guards for _LARGEFILE_SOURCE and _LARGEFILE64_SOURCE (#2444, \ 
@indygreg)
    build: Improve zlibwrapper Makefile (#2437, @Cyan4973)
    contrib: Add recover_directory Program (#2473, @terrelln)
    doc: Change License Year to 2021 (#2452 & #2465, @terrelln & @senhuang42)
    doc: Fix Typos (#2459, @ThomasWaldmann)