[file-roller] Bump requirements for GTK+

[Paolo Bacchilega <paobac src gnome org>]

commit 991d5b578065c4f1c47313581147f42465663038
Author: Yosef Or Boczko <yoseforb src gnome org>
Date:   Wed Mar 26 01:47:09 2014 +0200

    Bump requirements for GTK+
    
    For use-header-bar and gtk_dialog_get_header_bar().
    
    https://bugzilla.gnome.org/show_bug.cgi?id=727063

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index df5e11c..c917ec0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,7 +21,7 @@ AC_PATH_PROG(GLIB_COMPILE_RESOURCES, glib-compile-resources)
 
 GLIB_REQUIRED=2.36.0
 GIO_REQUIRED=2.36.0
-GTK_REQUIRED=3.9.3
+GTK_REQUIRED=3.12.0
 NAUTILUS_REQUIRED=2.22.2
 JSON_GLIB_REQUIRED=0.14.0
 LIBNOTIFY_REQUIRED=0.4.3