compilation fix for wxUSE_LOG==0

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47511 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/dfb/app.cpp

@@ -184,7 +184,9 @@ bool wxApp::Yield(bool onlyIfNeeded)
 
     s_inYield = true;
 
+#if wxUSE_LOG
     wxLog::Suspend();
+#endif // wxUSE_LOG
 
     wxEventLoop * const
         loop = wx_static_cast(wxEventLoop *, wxEventLoop::GetActive());
@@ -196,7 +198,9 @@ bool wxApp::Yield(bool onlyIfNeeded)
     // OnUpdateUI() which is a nice (and desired) side effect)
     while ( ProcessIdle() ) {}
 
+#if wxUSE_LOG
     wxLog::Resume();
+#endif // wxUSE_LOG
 
     s_inYield = false;