Always provide wxMenuItem bitmap-related methods in wxMSW.

Define these methods even when wxUSE_OWNER_DRAWN is turned off for some
reason. This allows to avoid ugly tests for !defined(__WXMSW__) ||
wxUSE_OWNER_DRAWN in the code that just wants to set a bitmap for a menu item.

Closes #12664.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70801 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/menu/menu.cpp

@@ -466,9 +466,7 @@ MyFrame::MyFrame()
 #if USE_LOG_WINDOW
     wxMenuItem *item = new wxMenuItem(fileMenu, Menu_File_ClearLog,
                                       wxT("Clear &log\tCtrl-L"));
-#if wxUSE_OWNER_DRAWN || defined(__WXGTK__)
     item->SetBitmap(copy_xpm);
-#endif
     fileMenu->Append(item);
     fileMenu->AppendSeparator();
 #endif // USE_LOG_WINDOW