[gnome-shell] build: Bump gtk+ requirement to 3.7.9

[Rico Tzschichholz <ricotz src gnome org>]

commit fb527139a0f0a0af16170b405ba01b2dbb6632e9
Author: Rico Tzschichholz <ricotz t-online de>
Date:   Fri Feb 15 09:41:01 2013 +0100

    build: Bump gtk+ requirement to 3.7.9
    
    Needed by 7fc2b33a0a16c9f821d8bea5190001efb1a41aa7

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 0ed832d..660aade 100644
--- a/configure.ac
+++ b/configure.ac
@@ -64,7 +64,7 @@ CLUTTER_MIN_VERSION=1.13.4
 GOBJECT_INTROSPECTION_MIN_VERSION=0.10.1
 GJS_MIN_VERSION=1.35.4
 MUTTER_MIN_VERSION=3.7.5
-GTK_MIN_VERSION=3.3.9
+GTK_MIN_VERSION=3.7.9
 GIO_MIN_VERSION=2.35.0
 LIBECAL_MIN_VERSION=3.5.3
 LIBEDATASERVER_MIN_VERSION=3.5.3