[gnome-tweak-tool] build: Require gsettings-desktop-schemas 3.23.3+

[Jeremy Bicha <jbicha src gnome org>]

commit 51d9b9da4308c58ab8b21883f6b660b32140444d
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Mon May 29 00:25:52 2017 -0400

    build: Require gsettings-desktop-schemas 3.23.3+
    
    for gtk-enable-primary-paste

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index ef9f695..fc3f5a1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,7 +7,7 @@ AC_CONFIG_MACRO_DIR([m4])
 AM_PATH_PYTHON([2.6])
 GLIB_GSETTINGS
 
-DESKTOP_SCHEMAS_REQUIRED_VERSION=3.21.2
+DESKTOP_SCHEMAS_REQUIRED_VERSION=3.23.3
 GTK_REQUIRED_VERSION=3.12.0
 PYGOBJECT_REQUIRED_VERSION=3.10