[mutter] build: Depend on gsettings-desktop-schemas >= 3.31.0

[Carlos Garnacho <carlosg src gnome org>]

commit 7a9805554c0f2b33af0f45a63698661cc59edadd
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Dec 6 18:18:16 2018 +0100

    build: Depend on gsettings-desktop-schemas >= 3.31.0
    
    This is necessary for MetaInputMapper. This version is unreleased
    yet but version was bumped in git.

 configure.ac | 2 +-
 meson.build  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 19e5f8fd2..eb61abd08 100644
--- a/configure.ac
+++ b/configure.ac
@@ -86,7 +86,7 @@ MUTTER_PC_MODULES="
    gio-unix-2.0 >= 2.35.1
    pango >= 1.2.0
    cairo >= 1.10.0
-   gsettings-desktop-schemas >= 3.21.4
+   gsettings-desktop-schemas >= 3.31.0
    json-glib-1.0
    gnome-desktop-3.0
    xcomposite >= 0.2
diff --git a/meson.build b/meson.build
index 0a824e750..f36ef75ea 100644
--- a/meson.build
+++ b/meson.build
@@ -17,7 +17,7 @@ uprof_req = '>= 0.3'
 pango_req = '>= 1.2.0'
 cairo_req = '>= 1.10.0'
 pangocairo_req = '>= 1.20'
-gsettings_desktop_schemas_req = '>= 3.21.4'
+gsettings_desktop_schemas_req = '>= 3.31.0'
 json_glib_req = '>= 0.12.0'
 upower_glib_req = '>= 0.99.0'
 xcomposite_req = '>= 0.4'