Avoid harmless warning about unused variables in wxOSX/Carbon.

Declare the variables only used when wxUSE_STATUSBAR==1 inside the check for
it.

Closes #16331.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76752 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/carbon/frame.cpp

@@ -356,12 +356,12 @@ void wxFrame::PositionToolBar()
 
     wxTopLevelWindow::DoGetClientSize( &cw , &ch );
 
-    int statusX = 0 ;
-    int statusY = 0 ;
-
 #if wxUSE_STATUSBAR
     if (GetStatusBar() && GetStatusBar()->IsShown())
     {
+        int statusX = 0 ;
+        int statusY = 0 ;
+
         GetStatusBar()->GetSize(&statusX, &statusY);
         ch -= statusY;
     }