Add wxDir::Close().

This is trivial to have and can sometimes be useful and also is symmetric to
Open().

Closes #14493.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72204 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/dir.h

@@ -160,11 +160,23 @@ public:
     wxDir(const wxString& dir);
 
     /**
-        Destructor cleans up the associated resources. It is not virtual and so
-        this class is not meant to be used polymorphically.
+        Destructor cleans up the associated resources by calling Close().
+
+        It is not virtual and so this class is not meant to be used
+        polymorphically.
     */
     ~wxDir();
 
+    /**
+        Close the directory.
+
+        The object can't be used after closing it, but Open() may be called
+        again to reopen it later.
+
+        @since 2.9.5
+    */
+    void Close();
+
     /**
         Test for existence of a directory with the given name.
     */