Merge topic 'tar-zstd-compression'

53cb1f2d04 cmake: Teach cmake -E tar command, Zstandard compression

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3357

Source/cmSystemTools.h

@@ -447,6 +447,7 @@ public:
     TarCompressGZip,
     TarCompressBZip2,
     TarCompressXZ,
+    TarCompressZstd,
     TarCompressNone
   };