Update to 7-Zip 17.01 Beta from Igor Pavlov

- Minor speed optimization for LZMA2 (xz and 7z) multi-threading compression.
  7-Zip now uses additional memory buffers for multi-block LZMA2 compression.
  CPU utilization was slightly improved.
- 7-zip now creates multi-block xz archives by default. Block size can be
  specified with -ms[Size]{m|g} switch.
- xz decoder now can unpack random block from multi-block xz archives.  7-Zip
  File Manager now can open nested multi-block xz archives (for example,
  image.iso.xz) without full unpacking of xz archive.
- 7-Zip now can create zip archives from stdin to stdout.
- 7-Zip command line: @listfile now doesn't work after -- switch.  Use
  -i@listfile before -- switch instead.

fixed bugs:
- 7-Zip could add unrequired alternate file streams to WIM archives, for
  commands that contain filename wildcards and -sns switch.
- 7-Zip 17.00 beta crashed for commands that write anti-item to 7z archive.
- 7-Zip 17.00 beta ignored "Use large memory pages" option.

CPP/7zip/Archive/Nsis/NsisIn.cpp

@@ -2489,7 +2489,7 @@ void CInArchive::DetectNsisType(const CBlockHeader &bh, const Byte *p)
           if (c2 == NS_3_CODE_VAR)
             // if (c2 <= NS_3_CODE_SKIP && c2 != NS_3_CODE_SHELL && c2 != 1)
           {
-            if ((strData[i+ 2] & 0x80) != 0)
+            if ((strData[i + 2] & 0x80) != 0)
             {
               // const char *p2 = (const char *)(strData + i + 1);
               // p2 = p2;
@@ -5048,6 +5048,12 @@ HRESULT CInArchive::Parse()
   DetectNsisType(bhEntries, _data + bhEntries.Offset);
 
   Decoder.IsNsisDeflate = (NsisType != k_NsisType_Nsis3);
+  
+  // some NSIS files (that are not detected as k_NsisType_Nsis3)
+  // use original (non-NSIS) Deflate
+  // How to detect these cases?
+
+  // Decoder.IsNsisDeflate = false;
 
 
   #ifdef NSIS_SCRIPT