ci/deqp: only print the commit list header when the list is not empty

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28168>

.gitlab-ci/container/build-deqp.sh

@@ -149,8 +149,10 @@ done
   else
     echo "dEQP $DEQP_API version $DEQP_VERSION"
   fi
-  echo "The following local patches are applied on top:"
-  git log --reverse --oneline "$DEQP_COMMIT".. --format='- %s'
+  if [ "$(git rev-parse HEAD)" != "$DEQP_COMMIT" ]; then
+    echo "The following local patches are applied on top:"
+    git log --reverse --oneline "$DEQP_COMMIT".. --format='- %s'
+  fi
 } > /deqp-$deqp_api/version
 
 # --insecure is due to SSL cert failures hitting sourceforge for zlib and