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Update symbol name mangling

Dženan Zukić requested to merge dzenanz/png:for/vtk into for/vtk

This avoids link errors in applications which depend on libPNG aside from the one in VTK, for example as bundled with OpenCV. Example error messages:

10>vtkpng-9.0d.lib(pngget.obj) : error LNK2005: png_get_eXIf already defined in libpngd.lib(pngget.obj) [M:\Dev\Plus\SP-VTK9\PlusLib-bin\src\PlusDataCollection\PlusVersion.vcxproj]
10>vtkpng-9.0d.lib(pngget.obj) : error LNK2005: png_get_eXIf_1 already defined in libpngd.lib(pngget.obj) [M:\Dev\Plus\SP-VTK9\PlusLib-bin\src\PlusDataCollection\PlusVersion.vcxproj]
10>vtkpng-9.0d.lib(pngset.obj) : error LNK2005: png_set_eXIf already defined in libpngd.lib(pngset.obj) [M:\Dev\Plus\SP-VTK9\PlusLib-bin\src\PlusDataCollection\PlusVersion.vcxproj]
10>vtkpng-9.0d.lib(pngset.obj) : error LNK2005: png_set_eXIf_1 already defined in libpngd.lib(pngset.obj) [M:\Dev\Plus\SP-VTK9\PlusLib-bin\src\PlusDataCollection\PlusVersion.vcxproj]
10>vtkpng-9.0d.lib(pngrutil.obj) : error LNK2005: png_handle_eXIf already defined in libpngd.lib(pngrutil.obj) [M:\Dev\Plus\SP-VTK9\PlusLib-bin\src\PlusDataCollection\PlusVersion.vcxproj]
10>vtkpng-9.0d.lib(pngrutil.obj) : error LNK2005: png_check_chunk_length already defined in libpngd.lib(pngrutil.obj) [M:\Dev\Plus\SP-VTK9\PlusLib-bin\src\PlusDataCollection\PlusVersion.vcxproj]
10>vtkpng-9.0d.lib(pngwutil.obj) : error LNK2005: png_write_eXIf already defined in libpngd.lib(pngwutil.obj) [M:\Dev\Plus\SP-VTK9\PlusLib-bin\src\PlusDataCollection\PlusVersion.vcxproj]

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