test x86_64-pc-windows-gnullvm to see if it works

Author: folkertdev

.github/workflows/checks.yaml

@@ -52,6 +52,10 @@ jobs:
             os: windows-2022
             features: ""
             target: "x86_64-pc-windows-msvc"
+          - rust: stable-x86_64-msvc
+            os: windows-2022
+            features: ""
+            target: "x86_64-pc-windows-gnullvm"
     steps:
       - name: Checkout sources
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11