CI: add testing with GTK build for Windows (msvc)

Closes: #265

Author: DjLegolas

.github/workflows/msvc-env.yml

@@ -37,11 +37,11 @@ jobs:
         python -m pip install C:\GTK\python\pycairo-1.26.1-cp312-cp312-win_amd64.whl C:\GTK\python\pygobject-3.48.2-cp312-cp312-win_amd64.whl
     - name: Prebuild
       run: |
-        echo %PATH%
-        where python
-        where meson
+        $env:GITHUB_PATH
+        (get-command python).Path
         python -V
         python -m pip install meson==1.0.0
+        (get-command meson).Path
         python C:/GTK/bin/g-ir-scanner --help
         meson setup _build
     - uses: BSFishy/meson-build@v1.0.3