Fix wxOSX compilation without PCH.

Explicitly include wx/nonownedwnd.h as we use wxNonOwnedWindow in this file.

Closes #11833.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63737 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/core/evtloop_cf.cpp

@@ -39,6 +39,10 @@
 #include "wx/osx/private.h"
 #include "wx/osx/core/cfref.h"
 
+#if wxUSE_GUI
+    #include "wx/nonownedwnd.h"
+#endif
+
 // ============================================================================
 // wxCFEventLoopSource and wxCFEventLoop implementation
 // ============================================================================