fix Visual Studio 16 2019 generator

[SSE4]

follow up on #4233
from @wumo
https://cmake.org/cmake/help/v3.14/generator/Visual%20Studio%2016%202019.html

tried with cmake-3.14.0-rc4 and got errors like:

1> [CMake] CMake Error: Could not create named generator Visual Studio 16 2019 Win64
1> [CMake] 
1> [CMake] Generators
1> [CMake] * Visual Studio 16 2019        = Generates Visual Studio 2019 project files.
1> [CMake]                                  Use -A option to specify architecture.
1> [CMake]   Visual Studio 15 2017 [arch] = Generates Visual Studio 2017 project files.
1> [CMake]                                  Optional [arch] can be "Win64" or "ARM".
1> [CMake]   Visual Studio 14 2015 [arch] = Generates Visual Studio 2015 project files.
1> [CMake]                                  Optional [arch] can be "Win64" or "ARM".
It seems that we cannot use Visual Studio 16 2019 Win64. Only Visual Studio 16 2019 -A x64 is valid.Cmake Doc:Visual Studio 16 2019

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