Remove dated text.

The reference to working on 64-bit machines is a bit dated, since all
software runs on 64-bit today.

Author: zayenz

index.html

@@ -50,7 +50,7 @@ <h2>Gecode</h2>
   <dt>portable</dt>
   <dd>Gecode is implemented in C++ that carefully follows the C++ standard.
       It can be compiled with modern C++ compilers and runs on
-      a wide range of machines (including 64bit machines).</dd>
+      a wide range of machines.</dd>
   <dt>parallel</dt>
   <dd>Gecode complies with reality in that it exploits the multiple cores
       of today's commodity hardware for parallel search, giving an already