[gtk+] Remove redundant declaration

[Emmanuele Bassi <ebassi src gnome org>]

commit d64ca9560c55ce540d6f8f90cb818e169f0079a9
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Oct 14 19:33:03 2016 +0100

    Remove redundant declaration

 gdk/gdkdisplaymanager.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/gdk/gdkdisplaymanager.c b/gdk/gdkdisplaymanager.c
index cbb5c4c..2950d80 100644
--- a/gdk/gdkdisplaymanager.c
+++ b/gdk/gdkdisplaymanager.c
@@ -121,7 +121,6 @@ enum {
   LAST_SIGNAL
 };
 
-static void gdk_display_manager_class_init   (GdkDisplayManagerClass *klass);
 static void gdk_display_manager_set_property (GObject                *object,
                                               guint                   prop_id,
                                               const GValue           *value,