Bracket vararg macro definition with wxHAS_VARIADIC_MACROS.

This should fix tests compilation with VC6.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73024 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/testing.h

@@ -387,6 +387,7 @@ private:
           wxExpectModal<> for your dialog type and implement its OnInvoked()
           method.
  */
+#ifdef wxHAS_VARIADIC_MACROS
 #define wxTEST_DIALOG(codeToRun, ...)                                          \
     {                                                                          \
         wxTEST_DIALOG_HOOK_CLASS wx_hook;                                      \
@@ -394,7 +395,7 @@ private:
         codeToRun;                                                             \
         wx_hook.CheckUnmetExpectations();                                      \
     }
-
+#endif /* wxHAS_VARIADIC_MACROS */
 
 #endif // !WXBUILDING