Also free internal handlers when wxMSW wxStaticBitmap is destroyed.

r76141 fixed the resource leak when wxStaticBitmap image was replaced by
another one but the leak still happened at the end, when the wxStaticBitmap
was destroyed.

Fix it there as well in the same way.

Closes #16068.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76145 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/statbmp.h

@@ -85,6 +85,10 @@ protected:
     WXHANDLE m_currentHandle;
 
 private:
+    // Replace the image at the native control level with the given HBITMAP or
+    // HICON (which can be 0) and destroy the previous image if necessary.
+    void MSWReplaceImageHandle(WXLPARAM handle);
+
     DECLARE_DYNAMIC_CLASS(wxStaticBitmap)
     wxDECLARE_EVENT_TABLE();
     wxDECLARE_NO_COPY_CLASS(wxStaticBitmap);