Add MSBuild to path.

.gitlab-ci.yml

@@ -297,6 +297,8 @@ windows:
     - git --version
     - $env:Path += ";C:\Program Files\CMake\bin\"
     - cmake --version
+    - $env:Path += ";C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Current\Bin"
+    - MSBuild.exe -version
 
   script:
     - cd $CI_PROJECT_DIR