[rygel] build: Lower gtk+-2.0 requirement to 2.20.0

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit f9bc56bb8c81aef32c2bc9deb87ea360471e77c6
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Sat Aug 28 04:38:15 2010 +0300

    build: Lower gtk+-2.0 requirement to 2.20.0

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f29e7cb..f52d51b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -143,7 +143,7 @@ AC_MSG_RESULT([$with_gtk])
 
 case "$with_gtk" in
   2.0) GTK_VAPI_VERSION=2.0
-       GTK_REQUIRED=2.21.5
+       GTK_REQUIRED=2.20.0
        ;;
   3.0) GTK_VAPI_VERSION=3.0
        GTK_REQUIRED=2.90.3