[folks] build: Bump the e-d-s dependency to 3.1.5

[Raul Gutierrez Segales <raulgs src gnome org>]

commit 061fdce9824dbbc2b41b3a239acf213d88e94bad
Author: Raul Gutierrez Segales <rgs collabora co uk>
Date:   Wed Aug 31 12:19:00 2011 +0100

    build: Bump the e-d-s dependency to 3.1.5
    
    We totally missed this on previous releases and
    it is now causing problems for packagers.

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 97abdc9..b1b65c7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -132,8 +132,8 @@ VALA_REQUIRED=0.13.3
 VALADOC_REQUIRED=0.3.1
 TRACKER_SPARQL_REQUIRED=0.10
 GCONF2_REQUIRED=2.31
-EBOOK_REQUIRED=3.0.1
-EDATASERVER_REQUIRED=3.0.1
+EBOOK_REQUIRED=3.1.5
+EDATASERVER_REQUIRED=3.1.5
 
 PKG_CHECK_MODULES([GLIB],
                   [glib-2.0 >= $GLIB_REQUIRED