build system: try to reproduce an issue of vs2019, toolset v141

.github/workflows/build.yml

@@ -34,13 +34,17 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest, windows-2016]
-        toolset: [clang-cl, default]
+        toolset: [clang-cl, default, v141]
         include:
           - toolset: clang-cl
             toolset_option: -T"ClangCl"
+          - toolset: v141
+            toolset_option: -T"v141"
         exclude:
           - os: windows-2016
             toolset: clang-cl
+          - os: windows-2016
+            toolset: v141
 
     runs-on: ${{ matrix.os }}