[gtkmm] Require the latest glibmm.

[Murray Cumming <murrayc src gnome org>]

commit 2b663106586838e868df8667945e6be274097c4f
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Jul 15 15:24:06 2015 +0200

    Require the latest glibmm.
    
    For the latest gmmproc.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 8473b6c..4c2e8b2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -93,7 +93,7 @@ AS_IF([test "x$enable_static" = xyes],
 # gdkmm really does need GTK+, because part of Gdk::DragContext is in GTK+.
 # The extra cairomm-1.0 check is because gdkmm requires a newer cairomm than pangomm requires.
 # The extra gdk-pixbuf-2.0 check is because gdkmm requires a newer gdk-pixbuf than gtk+-3.0 requires.
-AC_SUBST([GDKMM_MODULES], ['giomm-2.4 >= 2.45.2 pangomm-1.4 >= 2.27.1 gtk+-3.0 >= 3.17.3 cairomm-1.0 >= 
1.9.2 gdk-pixbuf-2.0 >= 2.26.0'])
+AC_SUBST([GDKMM_MODULES], ['giomm-2.4 >= 2.45.31 pangomm-1.4 >= 2.27.1 gtk+-3.0 >= 3.17.3 cairomm-1.0 >= 
1.9.2 gdk-pixbuf-2.0 >= 2.26.0'])
 
 AS_IF([test "x$gtkmm_host_windows" = xyes],
       [GTKMM_MODULES=$GDKMM_MODULES],