[gnome-documents] build: make sure to update the submodule on autogen

[Cosimo Cecchi <cosimoc src gnome org>]

commit a1ee31bc450a18d16d993ee76fac9cbfb0b04632
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Thu Aug 30 14:05:45 2012 -0400

    build: make sure to update the submodule on autogen

 autogen.sh |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index 13887fc..79c93bf 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -18,6 +18,8 @@ which gnome-autogen.sh || {
     exit 1
 }
 
+git submodule update --init --recursive
+
 REQUIRED_AUTOCONF_VERSION=2.59
 REQUIRED_AUTOMAKE_VERSION=1.9
 REQUIRED_INTLTOOL_VERSION=0.40.0