Fix stack overflow in cmdline[]

rmat=0x5631bec4df48 "Player2 no way to go. Player1 win!",
  args=args@entry=0x7fa3a12051a0) at vsprintf_chk.c:82
0x00007fa3e80e6efa in ___sprintf_chk (s=<optimized out>,
  flags=<optimized out>, slen=<optimized out>,
  format=<optimized out>) at sprintf_chk.c:31
0x00005631bec30f83 in NineChess::win(bool) ()
0x00005631bec34c63 in NineChess::place(int, long, bool) ()
0x00005631bec38b4f in NineChessAi_ab::alphaBetaPruning
  (unsigned char, short, short, NineChessAi_ab::Node*) ()

NineChess/src/ninechess.h

@@ -595,7 +595,7 @@ private:
 
     // 着法命令行用于棋谱的显示和解析
     // 当前着法的命令行指令，即一招棋谱
-    char cmdline[32];
+    char cmdline[64];
 
     // 棋谱
     list <string> cmdlist;

NineChess/src/ninechessai_ab.h

@@ -278,7 +278,7 @@ private:
 
 private:
     // 命令行
-    char cmdline[32];
+    char cmdline[64];
 };
 
 #ifdef HASH_MAP_ENABLE