VS: Exclude VS 2019 instances when using VS 2017 generator
Filter instances reported by the VS Installer to consider only VS 2017 instances for the "Visual Studio 15 2017" generator.
Fixes: #18721 (closed)
Filter instances reported by the VS Installer to consider only VS 2017 instances for the "Visual Studio 15 2017" generator.
Fixes: #18721 (closed)