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/Compress/Lzma2Encoder.h

@@ -16,16 +16,22 @@ class CEncoder:
   public ICompressCoder,
   public ICompressSetCoderProperties,
   public ICompressWriteCoderProperties,
+  public ICompressSetCoderPropertiesOpt,
   public CMyUnknownImp
 {
   CLzma2EncHandle _encoder;
 public:
-  MY_UNKNOWN_IMP3(ICompressCoder, ICompressSetCoderProperties, ICompressWriteCoderProperties)
+  MY_UNKNOWN_IMP4(
+      ICompressCoder,
+      ICompressSetCoderProperties,
+      ICompressWriteCoderProperties,
+      ICompressSetCoderPropertiesOpt)
  
   STDMETHOD(Code)(ISequentialInStream *inStream, ISequentialOutStream *outStream,
       const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress);
   STDMETHOD(SetCoderProperties)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps);
   STDMETHOD(WriteCoderProperties)(ISequentialOutStream *outStream);
+  STDMETHOD(SetCoderPropertiesOpt)(const PROPID *propIDs, const PROPVARIANT *props, UInt32 numProps);
 
   CEncoder();
   virtual ~CEncoder();