fix out of bounds access.

thx tdeval@ for mmap malloc.
okay naddy@

games/gnushogi/patches/patch-src_init_c

@@ -0,0 +1,12 @@
+$OpenBSD: patch-src_init_c,v 1.1 2004/08/16 14:58:48 espie Exp $
+--- src/init.c.orig	Fri May 19 10:44:14 1995
++++ src/init.c	Mon Aug 16 16:15:46 2004
+@@ -225,7 +225,7 @@ short distance (short a, short b) 
+ #else                
+ short distance (short a, short b)
+ {
+-  return (use_distdata ? (short)(*distdata)[(int)a][(int)b] : (short)computed_distance(a,b));
++  return (use_distdata && a < NO_SQUARES && b < NO_SQUARES ? (short)(*distdata)[(int)a][(int)b] : (short)computed_distance(a,b));
+ }
+ #endif                         
+