windows: fix MSBuild discovery via vswhere

See https://bugs.python.org/issue35699

Author: uranusjr

cpython-windows/build.py

@@ -117,7 +117,7 @@ def find_msbuild():
         print('%s does not exist' % vswhere)
         sys.exit(1)
 
-    p = subprocess.check_output([str(vswhere), '-latest', '-property', 'installationPath'])
+    p = subprocess.check_output([str(vswhere), '-latest', '-property', 'installationPath', '-products', '*'])
 
     # Strictly speaking the output may not be UTF-8.
     p = pathlib.Path(p.strip().decode('utf-8'))