[gtk+] Fix the build

[Matthias Clasen <matthiasc src gnome org>]

commit c0d3ed0739c149057078fd06116088503c97e018
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Nov 25 11:01:38 2017 -0500

    Fix the build
    
    A stray GdkScreen leftover.

 tests/testgtk.c |    9 ---------
 1 files changed, 0 insertions(+), 9 deletions(-)
---
diff --git a/tests/testgtk.c b/tests/testgtk.c
index b27ddb7..bf3ddc5 100644
--- a/tests/testgtk.c
+++ b/tests/testgtk.c
@@ -57,15 +57,6 @@ file_exists (const char *filename)
   return stat (filename, &statbuf) == 0;
 }
 
-GtkWidget *
-shape_create_icon (GdkScreen *screen,
-                  char      *xpm_file,
-                  gint       x,
-                  gint       y,
-                  gint       px,
-                  gint       py,
-                  gint       window_type);
-
 static GtkWidget *
 build_option_menu (gchar           *items[],
                   gint             num_items,