[glom] EggSpreadTableDnd: Use latest sigc::slot syntax.

[Murray Cumming <murrayc src gnome org>]

commit 68313c882220ed81fa5d3e01a4e45a1cbe0fdb28
Author: Murray Cumming <murrayc murrayc com>
Date:   Sun Dec 18 12:11:35 2016 +0100

    EggSpreadTableDnd: Use latest sigc::slot syntax.

 .../eggspreadtablemm/eggspreadtabledndmm.cc        |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/glom/utility_widgets/eggspreadtablemm/eggspreadtabledndmm.cc 
b/glom/utility_widgets/eggspreadtablemm/eggspreadtabledndmm.cc
index 13bedc0..7613b2e 100644
--- a/glom/utility_widgets/eggspreadtablemm/eggspreadtabledndmm.cc
+++ b/glom/utility_widgets/eggspreadtablemm/eggspreadtabledndmm.cc
@@ -41,7 +41,7 @@ namespace
 static gboolean EggSpreadTableDnd_signal_widget_drop_possible_callback(EggSpreadTableDnd* self, GtkWidget* 
p0, gboolean* drop_possible, void* data)
 {
   using namespace Egg;
-  typedef sigc::slot< bool, Gtk::Widget*, bool& > SlotType;
+  typedef sigc::slot<bool(Gtk::Widget*, bool&)> SlotType;
 
   // Do not try to call a signal on a disassociated wrapper.
   if(Glib::ObjectBase::_get_current_wrapper((GObject*) self))
@@ -69,7 +69,7 @@ static gboolean EggSpreadTableDnd_signal_widget_drop_possible_callback(EggSpread
 static gboolean EggSpreadTableDnd_signal_widget_drop_possible_notify_callback(EggSpreadTableDnd* self, 
GtkWidget* p0, gboolean* drop_possible, void* data)
 {
   using namespace Egg;
-  typedef sigc::slot< bool, Gtk::Widget*, bool& > SlotType;
+  typedef sigc::slot<bool(Gtk::Widget*, bool&)> SlotType;
 
   // Do not try to call a signal on a disassociated wrapper.
   if(Glib::ObjectBase::_get_current_wrapper((GObject*) self))