Update to 7-Zip Version 19.00

- Encryption strength for 7z archives was increased the size of random
  initialization vector was increased from 64-bit to 128-bit, and the
  pseudo-random number generator was improved.
- Some bugs were fixed.

CPP/7zip/Archive/7z/7zDecode.cpp

@@ -355,7 +355,9 @@ HRESULT CDecoder::Decode(
 
   unsigned i;
 
+  #if !defined(_7ZIP_ST)
   bool mt_wasUsed = false;
+  #endif
 
   for (i = 0; i < folderInfo.Coders.Size(); i++)
   {