Try a debian 9 build

.gitlab-ci.yml

@@ -2,7 +2,7 @@
 stages:
   - build
 
-build_ubuntu1804:
+ubuntu1804:
   image: ubuntu:18.04
   stage: build
   script:
@@ -16,4 +16,18 @@ build_ubuntu1804:
   artifacts:
     paths:
       - build/src/fe-gtk/hexchat
+debian9:
+  image: debian:9
+  stage: build
+  script:
+    - apt update -y -qq
+    - apt install -y 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