ci: be explicit about the meson setup subcommand

The old way of doing things is deprecated.

Signed-off-by: Eric Engestrom <eric@igalia.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20827>

.gitlab-ci/meson/build.sh

@@ -59,7 +59,8 @@ case $CI_JOB_NAME in
 esac
 
 rm -rf _build
-meson _build --native-file=native.file \
+meson setup _build \
+      --native-file=native.file \
       --wrap-mode=nofallback \
       --force-fallback-for perfetto \
       ${CROSS+--cross "$CROSS_FILE"} \