few warnings left

[psyborg55]

built the latest version, it is much cleaner now, still several warnings noticed:

/home/tom/new/neumodvb/neumowxsvg/src/cairo/SVGCanvasCairo.cpp: In member function ‘void wxSVGCanvasCairo::SetClipPath(const wxCSSPrimitiveValue&, wxSVGMatrix&, wxSVGSVGElement&)’:
/home/tom/new/neumodvb/neumowxsvg/src/cairo/SVGCanvasCairo.cpp:593:50: warning: ‘this’ pointer is null [-Wnonnull]
  593 |         if (!clipPathElem && clipPathElem->GetDtd() != wxSVG_CLIPPATH_ELEMENT)
      |                              ~~~~~~~~~~~~~~~~~~~~^~

/home/tom/new/neumodvb/neumowxsvg/src/SVGDocument.cpp: In member function ‘void wxSVGDocument::SetTitle(const wxString&)’:
/home/tom/new/neumodvb/neumowxsvg/src/SVGDocument.cpp:82:31: warning: ‘this’ pointer is null [-Wnonnull]
   82 |                 elem->AddChild(new wxSvgXmlNode(wxSVGXML_TEXT_NODE, wxEmptyString, title));
      |                 ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /home/tom/new/neumodvb/neumowxsvg/include/wxSVG/Document.h:18,
                 from /home/tom/new/neumodvb/neumowxsvg/include/wxSVG/SVGDocument.h:17,
                 from /home/tom/new/neumodvb/neumowxsvg/src/SVGDocument.cpp:11:
/home/tom/new/neumodvb/neumowxsvg/include/wxSVGXML/svgxml.h:138:10: note: in a call to non-static member function ‘void wxSvgXmlNode::AddChild(wxSvgXmlNode*)’
  138 |     void AddChild(wxSvgXmlNode* child);
      |          ^~~~~~~~

cc1: warning: command-line option ‘-fsized-deallocation’ is valid for C++/ObjC++ but not for C

clang: warning: /home/tom/new/neumodvb/pybind11/include: 'linker' input unused [-Wunused-command-line-argument]