Fix ownership transfer in SetDataObject

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@74667 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Updated wx.lib.pdfviewer with patches from David Hughes.

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@74668 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@74669 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@74670 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@74671 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775