[atkmm] Link to the glibmm-2.52 version of glibmm_generate_extra_defs.

[Murray Cumming <murrayc src gnome org>]

commit 5cf4f5e3686419a26df5c1f81a6df9dee6389011
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Nov 15 21:18:11 2016 +0100

    Link to the glibmm-2.52 version of glibmm_generate_extra_defs.

 codegen/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/codegen/Makefile.am b/codegen/Makefile.am
index 291a881..2385b19 100644
--- a/codegen/Makefile.am
+++ b/codegen/Makefile.am
@@ -30,7 +30,7 @@ dist_noinst_SCRIPTS = generate_defs_and_docs.sh
 noinst_PROGRAMS  = extradefs/generate_extra_defs
 
 extradefs_generate_extra_defs_SOURCES = extradefs/generate_extra_defs_atk.cc
-extradefs_generate_extra_defs_LDADD   = $(ATKMM_LIBS) -lglibmm_generate_extra_defs-2.4
+extradefs_generate_extra_defs_LDADD   = $(ATKMM_LIBS) -lglibmm_generate_extra_defs-2.52
 extradefs_generate_extra_defs_LDFLAGS = -no-undefined -avoid-version
 
 AM_CPPFLAGS = -I$(top_builddir) $(GTHREAD_CFLAGS) $(ATKMM_CFLAGS)