Compilation fix for PCH-less build after r74586.

Don't use wxWindow methods in wx/container.h, move AcceptsFocus()
implementation to containr.cpp.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74588 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/containr.h

@@ -76,8 +76,7 @@ public:
     bool DoSetFocus();
 
     // returns whether we should accept focus ourselves or not
-    bool AcceptsFocus() const
-        { return m_acceptsFocusSelf && m_winParent->CanBeFocused(); }
+    bool AcceptsFocus() const;
 
     // Returns whether we or one of our children accepts focus.
     bool AcceptsFocusRecursively() const