update C sources

unarrc/external/unarr/AUTHORS

@@ -5,6 +5,7 @@
 * Felix Kauselmann (licorn at gmail.com)
 * Bastien Nocera (hadess@hadess.net, http://www.hadess.net/)
 * Wang Xinyu (comicfans44 at gmail.com)
+* Liu Xiang (liuxiang@loongson.cn, https://www.loongson.cn/)
 
 Most code is licensed under LGPLv3 (see COPYING). Exceptions are in code
 included from other projects:

unarrc/external/unarr/lzmasdk/7z.h

@@ -1,5 +1,5 @@
 /* 7z.h -- 7z interface
-2017-04-03 : Igor Pavlov : Public domain */
+2018-07-02 : Igor Pavlov : Public domain */
 
 #ifndef __7Z_H
 #define __7Z_H
@@ -91,6 +91,8 @@ typedef struct
   UInt64 *CoderUnpackSizes;       // for all coders in all folders
 
   Byte *CodersData;
+
+  UInt64 RangeLimit;
 } CSzAr;
 
 UInt64 SzAr_GetFolderUnpackSize(const CSzAr *p, UInt32 folderIndex);
@@ -106,7 +108,7 @@ typedef struct
 
   UInt64 startPosAfterHeader;
   UInt64 dataPos;
-
+  
   UInt32 NumFiles;
 
   UInt64 *UnpackPositions;  // NumFiles + 1
@@ -163,10 +165,10 @@ UInt16 *SzArEx_GetFullNameUtf16_Back(const CSzArEx *p, size_t fileIndex, UInt16
       *outBufferSize
     You can consider "*outBuffer" as cache of solid block. If your archive is solid,
     it will increase decompression speed.
-
+  
     If you use external function, you can declare these 3 cache variables
     (blockIndex, outBuffer, outBufferSize) as static in that external function.
-
+    
     Free *outBuffer and set *outBuffer to 0, if you want to flush cache.
 */