[gnome-system-monitor] Bump glibmm/giomm required version to 2.46.

[Benoît Dejean <bdejean src gnome org>]

commit 8a236836ddaa8522873bad5bb6bdd935a101fd68
Author: Benoît Dejean <bdejean gmail com>
Date:   Thu Oct 13 19:24:56 2016 +0200

    Bump glibmm/giomm required version to 2.46.

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 7eed2fc..5d2dc4f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -34,8 +34,8 @@ LIBGTOP_REQUIRED=2.28.2
 GTK_REQUIRED=3.12.0
 GNOME_ICON_THEME_REQUIRED=2.31
 GTKMM_REQUIRED=3.3.18
-GIOMM_REQUIRED=2.27
-GLIBMM_REQUIRED=2.27
+GIOMM_REQUIRED=2.46
+GLIBMM_REQUIRED=2.46
 LIBXML_REQUIRED=2.0
 RSVG_REQUIRED=2.35
 SYSTEMD_REQUIRED=44