gitlab-ci: Also run meson from the dist tarball

.gitlab-ci/run_distcheck.sh

@@ -16,5 +16,27 @@ DISPLAY=:99 make distcheck V=1 VERBOSE=1
 RESULT=$?
 set -e
 
+# If make distcheck failed don't even bother with the meson check, the tarball
+# may be invalid and it's just a waste
+if [ $RESULT -ne 0 ]; then
+    kill %Xvfb
+    exit $RESULT
+fi
+
+# Also check that the meson build works from the dist tarball
+
+# We don't have a good way to know what the name of the archive will be (since
+# it has the version in it). Therefore, write the tarball to a place we know
+# the name of and work from there.
+mkdir libglvnd
+tar -xf libglvnd-*.tar.gz -C libglvnd --strip-components 1
+pushd libglvnd
+meson builddir --auto-features=enabled
+set +e
+DISPLAY=:99 ninja -C builddir test
+RESULT=$?
+set -e
+popd
+
 kill %Xvfb
 exit $RESULT