[D] Fixed possible output ordering issue in test case.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@12901 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/d/variables/d2/runme.d

@@ -66,6 +66,7 @@ void main() {
   example.pt = example.ptptr;
 
   write( "The new value is " );
+  stdout.flush();
   example.pt_print();
   writefln( "You should see the value %s", example.Point_print(example.ptptr) );
 }