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.

C/Util/7z/7zMain.c

@@ -1,5 +1,5 @@
 /* 7zMain.c - Test application for 7z Decoder
-2017-04-05 : Igor Pavlov : Public domain */
+2017-08-26 : Igor Pavlov : Public domain */
 
 #include "Precomp.h"
 
@@ -616,7 +616,14 @@ int MY_CDECL main(int numargs, char *args[])
           
           #ifdef USE_WINDOWS_FILE
           if (SzBitWithVals_Check(&db.Attribs, i))
-            SetFileAttributesW(destPath, db.Attribs.Vals[i]);
+          {
+            UInt32 attrib = db.Attribs.Vals[i];
+            /* p7zip stores posix attributes in high 16 bits and adds 0x8000 as marker.
+               We remove posix bits, if we detect posix mode field */
+            if ((attrib & 0xF0000000) != 0)
+              attrib &= 0x7FFF;
+            SetFileAttributesW(destPath, attrib);
+          }
           #endif
         }
         PrintLF();