Use meson setup command explicitly

Invoking "meson $DIR" without "setup" is deprecated.

Author: ptomato

.github/workflows/build.yml

@@ -62,5 +62,5 @@ jobs:
         ccache -s
     - name: Build Examples
       run: |
-        meson _build || cat _build/meson-logs/meson-log.txt
+        meson setup _build || cat _build/meson-logs/meson-log.txt
         ninja -C _build