[gtk+] Drop another unused debug value

[Matthias Clasen <matthiasc src gnome org>]

commit 124a7969eb39b9aa45442ec1bf7526ea8ed7cb97
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jan 9 23:07:08 2018 -0500

    Drop another unused debug value
    
    GTK_DEBUG_MULTIHEAD is unused as well.

 gtk/gtkdebug.h |   37 ++++++++++++++++++-------------------
 gtk/gtkmain.c  |    1 -
 2 files changed, 18 insertions(+), 20 deletions(-)
---
diff --git a/gtk/gtkdebug.h b/gtk/gtkdebug.h
index b42eba9..1f1c09d 100644
--- a/gtk/gtkdebug.h
+++ b/gtk/gtkdebug.h
@@ -35,25 +35,24 @@
 G_BEGIN_DECLS
 
 typedef enum {
-  GTK_DEBUG_TEXT            = 1 << 1,
-  GTK_DEBUG_TREE            = 1 << 2,
-  GTK_DEBUG_UPDATES         = 1 << 3,
-  GTK_DEBUG_KEYBINDINGS     = 1 << 4,
-  GTK_DEBUG_MULTIHEAD       = 1 << 5,
-  GTK_DEBUG_MODULES         = 1 << 6,
-  GTK_DEBUG_GEOMETRY        = 1 << 7,
-  GTK_DEBUG_ICONTHEME       = 1 << 8,
-  GTK_DEBUG_PRINTING        = 1 << 9,
-  GTK_DEBUG_BUILDER         = 1 << 10,
-  GTK_DEBUG_SIZE_REQUEST    = 1 << 11,
-  GTK_DEBUG_NO_CSS_CACHE    = 1 << 12,
-  GTK_DEBUG_BASELINES       = 1 << 13,
-  GTK_DEBUG_INTERACTIVE     = 1 << 14,
-  GTK_DEBUG_TOUCHSCREEN     = 1 << 15,
-  GTK_DEBUG_ACTIONS         = 1 << 16,
-  GTK_DEBUG_RESIZE          = 1 << 17,
-  GTK_DEBUG_LAYOUT          = 1 << 18,
-  GTK_DEBUG_SNAPSHOT        = 1 << 19
+  GTK_DEBUG_TEXT            = 1 <<  0,
+  GTK_DEBUG_TREE            = 1 <<  1,
+  GTK_DEBUG_UPDATES         = 1 <<  2,
+  GTK_DEBUG_KEYBINDINGS     = 1 <<  3,
+  GTK_DEBUG_MODULES         = 1 <<  4,
+  GTK_DEBUG_GEOMETRY        = 1 <<  5,
+  GTK_DEBUG_ICONTHEME       = 1 <<  6,
+  GTK_DEBUG_PRINTING        = 1 <<  7,
+  GTK_DEBUG_BUILDER         = 1 <<  8,
+  GTK_DEBUG_SIZE_REQUEST    = 1 <<  9,
+  GTK_DEBUG_NO_CSS_CACHE    = 1 << 10,
+  GTK_DEBUG_BASELINES       = 1 << 11,
+  GTK_DEBUG_INTERACTIVE     = 1 << 12,
+  GTK_DEBUG_TOUCHSCREEN     = 1 << 13,
+  GTK_DEBUG_ACTIONS         = 1 << 14,
+  GTK_DEBUG_RESIZE          = 1 << 15,
+  GTK_DEBUG_LAYOUT          = 1 << 16,
+  GTK_DEBUG_SNAPSHOT        = 1 << 17
 } GtkDebugFlag;
 
 #ifdef G_ENABLE_DEBUG
diff --git a/gtk/gtkmain.c b/gtk/gtkmain.c
index 12f4da3..94787f5 100644
--- a/gtk/gtkmain.c
+++ b/gtk/gtkmain.c
@@ -157,7 +157,6 @@ static const GDebugKey gtk_debug_keys[] = {
   { "tree", GTK_DEBUG_TREE },
   { "updates", GTK_DEBUG_UPDATES },
   { "keybindings", GTK_DEBUG_KEYBINDINGS },
-  { "multihead", GTK_DEBUG_MULTIHEAD },
   { "modules", GTK_DEBUG_MODULES },
   { "geometry", GTK_DEBUG_GEOMETRY },
   { "icontheme", GTK_DEBUG_ICONTHEME },