InstallRequiredSystemLibraries doesn't set MSVC_REDIST_DIR with VS2019 IDE and v141 toolset specified
## Background info - CMake Gui 3.14.6 for Windows downloaded from Cmake.org/download. - Visual Studio Community 2019 16.1.6 - with MSVC 141 - VS 2017 C++ x64/x86 build tools and the MSVC v140 - VS 2015 C++ build tools I configure a project with Visual Studio 16 2019 as the generator and specify the optional toolset of v141. MSVC_RESDIST_DIR isn't found even though C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Redist\MSVC\14.16.27012 does actually exist with the appropriate files. This is not a problem when specifying VS2019 generator with v142 toolset. It sets MSVC_REDIST_DIR as C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Redist/MSVC/14.21.27702. This is also not a problem when specifying VS2019 generator with v140 toolset. It sets MSVC_REDIST_DIR as C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/redist. I've never had Visual Studio 2017 IDE installed on my system. ## To Reproduce With a CMakeLists.txt ``` cmake_minimum_required(VERSION 3.14) add_executable(main main.cpp) install(TARGETS main RUNTIME DESTINATION bin) include(InstallRequiredSystemLibraries) ``` and a test called main.cpp ``` int main() {} ``` results in the CMake Warning when configuring ``` CMake Warning at C:/Program Files/CMake/share/cmake-3.14/Modules/InstallRequiredSystemLibraries.cmake:558 (message): system runtime library file does not exist: 'MSVC_REDIST_DIR-NOTFOUND/x64/Microsoft.VC141.CRT/concrt140.dll' Call Stack (most recent call first): CMakeLists.txt:4 (include) ```
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