[gnome-panel] add missing xi dependency

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 0e70ba2866802fd4ff260e587881b408054e3fda
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Jun 16 22:40:43 2019 +0300

    add missing xi dependency
    
    https://gitlab.gnome.org/GNOME/gnome-panel/issues/12

 .gitlab-ci.yml | 1 +
 configure.ac   | 1 +
 2 files changed, 2 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ff1cf6ed6..1847f74c0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -34,6 +34,7 @@ build-ubuntu:
                       libwnck-3-dev
                       libx11-dev
                       libxau-dev
+                      libxi-dev
                       libxrandr-dev
                       pkg-config
                       yelp-tools
diff --git a/configure.ac b/configure.ac
index 44eb74212..c2c0037e4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -142,6 +142,7 @@ PKG_CHECK_MODULES([PANEL], [
   libgnome-menu-3.0 >= $LIBGNOME_MENU_REQUIRED
   dconf >= $DCONF_REQUIRED
   x11
+  xi
   xrandr >= $XRANDR_REQUIRED
 ])