[gtk+] Drop a nonexisting variable

[Matthias Clasen <matthiasc src gnome org>]

commit 11cf6763a35289f46ded2ce0ad77759c82e24c78
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Nov 30 15:13:45 2014 -0500

    Drop a nonexisting variable

 gtk/Makefile.am |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 4a783d9..9159aed 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -681,8 +681,7 @@ gtk_private_h_sources =             \
        gtkwin32themeprivate.h  \
        gtkwindowprivate.h      \
        gtktreemenu.h           \
-       $(gtk_private_type_h_sources) \
-       $(gtk_clipboard_dnd_h_sources)
+       $(gtk_private_type_h_sources) 
 
 a11y_c_sources =                               \
        a11y/gtkaccessibility.c                 \