Reconcile HAVE_VARIADIC_MACROS and wxHAS_VARIADIC_MACROS definitions.

The main user-visible effect of this change is that giving configure
--disable-vararg-macros argument now really disables the use of variadic
macros whereas it didn't disable them in wx/cpp.h before.

It is, of course, also less confusing to not have two very similar but
different symbols.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74489 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/testing.h

@@ -337,7 +337,7 @@ private:
           wxExpectModal<> for your dialog type and implement its OnInvoked()
           method.
  */
-#ifdef wxHAS_VARIADIC_MACROS
+#ifdef HAVE_VARIADIC_MACROS
 #define wxTEST_DIALOG(codeToRun, ...)                                          \
     {                                                                          \
         wxTEST_DIALOG_HOOK_CLASS wx_hook;                                      \
@@ -345,7 +345,7 @@ private:
         codeToRun;                                                             \
         wx_hook.CheckUnmetExpectations();                                      \
     }
-#endif /* wxHAS_VARIADIC_MACROS */
+#endif /* HAVE_VARIADIC_MACROS */
 
 #endif // !WXBUILDING