Simplify platform test when creating hint window

Instead of checking for all the other platforms, just check for non-Mac
as the code in this branch should work (and definitely should compile)
in any port and it's just wxOSX which requires special handling here.

This fixes the build under the other platforms (e.g. wxX11) broken by
the changes of e8a6f3b732 (Use wxSYS_COLOUR_HOTLIGHT for hint background
under Mac too, 2023-12-24).

src/aui/framemanager.cpp

@@ -844,7 +844,7 @@ void wxAuiManager::UpdateHintWindowConfig()
     if ((m_flags & wxAUI_MGR_TRANSPARENT_HINT) && can_do_transparent)
     {
         // Make a window to use for a transparent hint
-        #if defined(__WXMSW__) || defined(__WXGTK__) || defined(__WXQT__)
+        #ifndef __WXMAC__
             m_hintWnd = new wxFrame(m_frame, wxID_ANY, wxEmptyString,
                                      wxDefaultPosition, wxSize(1,1),
                                          wxFRAME_TOOL_WINDOW |
@@ -854,7 +854,7 @@ void wxAuiManager::UpdateHintWindowConfig()
 
             // We can set the background of the frame itself directly.
             auto bgWnd = m_hintWnd;
-        #elif defined(__WXMAC__)
+        #else // Mac
             // Using a miniframe with float and tool styles keeps the parent
             // frame activated and highlighted as such...
             m_hintWnd = new wxMiniFrame(m_frame, wxID_ANY, wxEmptyString,