fix some shift overflows in thordb.c

thordb.c

@@ -2096,44 +2096,44 @@ database_search( int *in_board,
       if ( in_board[pos] != EMPTY ) {
 	index = 8 * i + j;
 	if ( index < 32 )
-	  shape_lo[0] |= (1 << index);
+	  shape_lo[0] |= (1u << index);
 	else
-	  shape_hi[0] |= (1 << (index - 32));
+	  shape_hi[0] |= (1u << (index - 32));
 	index = 8 * i + (7 - j);
 	if ( index < 32 )
-	  shape_lo[1] |= (1 << index);
+	  shape_lo[1] |= (1u << index);
 	else
-	  shape_hi[1] |= (1 << (index - 32));
+	  shape_hi[1] |= (1u << (index - 32));
 	index = 8 * j + i;
 	if ( index < 32 )
-	  shape_lo[2] |= (1 << index);
+	  shape_lo[2] |= (1u << index);
 	else
-	  shape_hi[2] |= (1 << (index - 32));
+	  shape_hi[2] |= (1u << (index - 32));
 	index = 8 * j + (7 - i);
 	if ( index < 32 )
-	  shape_lo[3] |= (1 << index);
+	  shape_lo[3] |= (1u << index);
 	else
-	  shape_hi[3] |= (1 << (index - 32));
+	  shape_hi[3] |= (1u << (index - 32));
 	index = 8 * (7 - i) + j;
 	if ( index < 32 )
-	  shape_lo[4] |= (1 << index);
+	  shape_lo[4] |= (1u << (index));
 	else
-	  shape_hi[4] |= (1 << (index - 32));
+	  shape_hi[4] |= (1u << (index - 32));
 	index = 8 * (7 - i) + (7 - j);
 	if ( index < 32 )
-	  shape_lo[5] |= (1 << index);
+	  shape_lo[5] |= (1u << index);
 	else
-	  shape_hi[5] |= (1 << (index - 32));
+	  shape_hi[5] |= (1u << (index - 32));
 	index = 8 * (7 - j) + i;
 	if ( index < 32 )
-	  shape_lo[6] |= (1 << index);
+	  shape_lo[6] |= (1u << index);
 	else
-	  shape_hi[6] |= (1 << (index - 32));
+	  shape_hi[6] |= (1u << (index - 32));
 	index = 8 * (7 - j) + (7 - i);
 	if ( index < 32 )
-	  shape_lo[7] |= (1 << index);
+	  shape_lo[7] |= (1u << index);
 	else
-	  shape_hi[7] |= (1 << (index - 32));
+	  shape_hi[7] |= (1u << (index - 32));
       }
 
   /* Get the corner mask */