[glom/gtkmm4v4] gtkmm4: tests: Fix build with C++11 class enums.

[Murray Cumming <murrayc src gnome org>]

commit 63222d28501cc0eb02e0d9a94070baef557907e8
Author: Murray Cumming <murrayc murrayc com>
Date:   Sat Apr 15 22:01:58 2017 +0200

    gtkmm4: tests: Fix build with C++11 class enums.

 .../eggspreadtablemm/test_spreadtablednd.cc        |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/glom/utility_widgets/eggspreadtablemm/test_spreadtablednd.cc 
b/glom/utility_widgets/eggspreadtablemm/test_spreadtablednd.cc
index 32c806d..a0715f6 100644
--- a/glom/utility_widgets/eggspreadtablemm/test_spreadtablednd.cc
+++ b/glom/utility_widgets/eggspreadtablemm/test_spreadtablednd.cc
@@ -311,7 +311,7 @@ create_window()
   combo_halign->append("Start");
   combo_halign->append("End");
   combo_halign->append("Center");
-  combo_halign->set_active(INITIAL_HALIGN);
+  combo_halign->set_active(static_cast<int>(INITIAL_HALIGN));
   combo_halign->show();
 
   combo_halign->set_tooltip_text("Set the children's halign property");