ccstruct: Fix compiler warning (disable buggy code)

gcc reports a potential bad array access:

ccstruct/mod128.cpp:98:20: warning:
 array subscript has type 'char' [-Wchar-subscripts]

dir is of type 'char'. Most compilers use signed char by default.
Then the value of dir is in the range -128 ... 127 and cannot be
used to access an array with 256 elements.

Don't fix that but disable the buggy code.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

Author: stweil

ccstruct/mod128.cpp

@@ -94,6 +94,8 @@ DIR128::DIR128(                 //from fcoord
  * Convert a direction to a vector.
  **********************************************************************/
 
+#if 0 // code is buggy for negative dir and unused
 ICOORD DIR128::vector() const {  //convert to vector
   return dirtab[dir];            //easy really
 }
+#endif