Move wxBell() from base to core library.

This allows to get rid of ugly preprocessor checks due to the fact that this
function could be defined in one or the other library depending on the port
used and also fix a problem with it being defined differently in the base
library depending on which GUI port (Carbon or Cocoa) was used under OS X.
It also fixes the problem with wxBell() in wxGTK under Windows.

Closes #14406.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71797 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/motif/utils.cpp

@@ -112,14 +112,11 @@ int wxGUIAppTraits::AddProcessCallback(wxEndProcessData *proc_data, int fd)
 // ----------------------------------------------------------------------------
 
 // Emit a beeeeeep
-#ifndef __EMX__
-// on OS/2, we use the wxBell from wxBase library (src/os2/utils.cpp)
 void wxBell()
 {
     // Use current setting for the bell
     XBell (wxGlobalDisplay(), 0);
 }
-#endif
 
 wxPortId wxGUIAppTraits::GetToolkitVersion(int *verMaj, int *verMin) const
 {