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Chun-wei Fan authored
Visual Studio 2017 is required to support the C++-14 features that glibmm-2.52 will require, so update the projects to 2017. Make the projects look for libsigc++-3.x as well. Also make sure that the glibmm and giomm projects are up-to-date, and drop the threading examples projects as these examples have been dropped from the tree, and ensure the headers "installed" are up-to-date.
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