[gnome-continuous] Add libGLU to the build

[Emmanuele Bassi <ebassi src gnome org>]

commit 91e41182768daac52cac6f29b659d483465addcd
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Jan 22 17:53:47 2019 +0000

    Add libGLU to the build
    
    New dependency for Mutter.

 manifest.json | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/manifest.json b/manifest.json
index 2086d5b..42483bb 100644
--- a/manifest.json
+++ b/manifest.json
@@ -311,6 +311,9 @@
                  "force-autotools": true,
                 "config-opts": ["--disable-valgrind"]},
 
+                {"src": "git:https://gitlab.freedesktop.org/mesa/glu.git";,
+                 "name": "glu"},
+
                {"src": "fd-wayland:wayland",
                 "config-opts": ["--disable-documentation"]},