[gnome-continuous] Pin Vala

[Emmanuele Bassi <ebassi src gnome org>]

commit 31b20c89f0e6304241b35f05c468a5498f4e8acc
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Jun 28 16:14:41 2017 +0100

    Pin Vala
    
    Vala merged valadoc in tree, and that introduced a hard dependency on
    Graphviz.
    
    While we figure out how to add Graphiz to Continuous, let's pin Vala and
    resume building.

 manifest.json |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index f771f03..37747ab 100644
--- a/manifest.json
+++ b/manifest.json
@@ -106,6 +106,8 @@
                                 "--disable-vapigen"]},
 
                {"src": "gnome:vala",
+                 "tag": "497f370a8c39f16eece6f97d379f24f66b56e1d4",
+                 "tag-reason": "Vala now hard-depends on graphviz",
                 "config-opts": ["--enable-vapigen"]},
 
                {"src": "git:git://github.com/seccomp/libseccomp",