Add files to build with old icons

.gitlab-ci.yml

+---
+stages:
+  - build
+
+build_ubuntu1804:
+  image: ubuntu:18.04
+  stage: build
+  script:
+    - apt update -y -qq
+    - apt install -q build-essential meson libcanberra-dev libdbus-glib-1-dev libglib2.0-dev libgtk2.0-dev libluajit-5.1-dev libnotify-dev libpci-dev libperl-dev libproxy-dev libssl-dev python3-dev appstream-util
+    - cd old_icons
+    - bash replace.sh
+    - cd ..
+    - meson build
+    - ninja -C build
+  artifacts:
+    paths:
+      - build/src/fe-gtk/hexchat
+

old_icons/replace.sh

+#!/bin/bash
+
+cp ulist_* ../data/icons/