BUG: fix check for no std::

Templates/configure.in

@@ -532,7 +532,7 @@ void foo() { std::list<int> l; }
   if test -z "`${CXX} $CXXFLAGS $CPPFLAGS -c conftest.cc 2>&1`"; then
     echo "$ac_t""yes" 1>&6
   else
-    AC_DEFINE(CMAKE_NO_STD_NAMESPACE)
+    CMAKE_NO_STD_NAMESPACE="1"
     echo "$ac_t""no" 1>&6
   fi
 fi