Fix new wxExecute() code compilation with wxUSE_CONSOLE_EVENTLOOP==0.

Nothing is going to work without the console apps/base traits support for the
event loop but at least make it compile.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74531 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/evtloopcmn.cpp

@@ -124,12 +124,16 @@ wxEventLoopBase::AddSourceForFD(int fd,
                                 wxEventLoopSourceHandler *handler,
                                 int flags)
 {
+#if wxUSE_CONSOLE_EVENTLOOP
     // Delegate to the event loop sources manager defined by it.
     wxEventLoopSourcesManagerBase* const
         manager = wxApp::GetValidTraits().GetEventLoopSourcesManager();
     wxCHECK_MSG( manager, NULL, wxS("Must have wxEventLoopSourcesManager") );
 
     return manager->AddSourceForFD(fd, handler, flags);
+#else // !wxUSE_CONSOLE_EVENTLOOP
+    return NULL;
+#endif // wxUSE_CONSOLE_EVENTLOOP/!wxUSE_CONSOLE_EVENTLOOP
 }
 
 #endif // wxUSE_EVENTLOOP_SOURCE