[atkmm] configure.ac: Require the latest glibmm.

[Murray Cumming <murrayc src gnome org>]

commit a29d63e5da682230f314c19c6f1f14943759f65c
Author: Murray Cumming <murrayc murrayc com>
Date:   Sat Aug 22 14:07:05 2015 +0200

    configure.ac: Require the latest glibmm.
    
    To use the latest gmmproc, which generates more move operations,
    and to have the latest Glib::Object/ObjectBase/Interface which have
    move operations that those generated move operations call.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index bbe3b3a..309e66c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -50,7 +50,7 @@ MM_AX_CXX_COMPILE_STDCXX_11([noext],[mandatory])
 AC_DISABLE_STATIC
 LT_INIT([win32-dll])
 
-AC_SUBST([ATKMM_MODULES], ['atk >= 1.16 glibmm-2.4 >= 2.45.31'])
+AC_SUBST([ATKMM_MODULES], ['atk >= 1.16 glibmm-2.4 >= 2.45.52'])
 PKG_CHECK_MODULES([ATKMM], [$ATKMM_MODULES])
 
 MM_PKG_CONFIG_SUBST([GTHREAD_CFLAGS], [--cflags-only-other gthread-2.0])