Commits on Feb 8, 2023

1. Fix empty-block.zst golden decompression file …

   This frame is invalid because the `Window_Size = 0`, and the
   `Block_Maximum_Size = min(128 KB, Window_Size) = 0`. But the empty
   compressed block has a `Block_Content` size of 2, which is invalid.
   
   The fix is to switch to using a `Window_Descriptor` instead of the
   `Single_Segment_Flag`. This sets the `Window_Size = 1024`.
   
   Hexdump before this PR: `28b5 2ffd 2000 1500 0000 00`
   
   Hexdump after this PR: `28b5 2ffd 0000 1500 0000 00`
   
   For issue facebook#3482.

   

   terrelln committed Feb 8, 2023
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