[gtk+] Drop a reference to gtkthemingengineprivate.h

[Matthias Clasen <matthiasc src gnome org>]

commit 911f3fb6d29f1570a2d30db6f2085d0202e7ad2a
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Oct 22 01:18:54 2014 -0400

    Drop a reference to gtkthemingengineprivate.h
    
    That file does not exist.

 gtk/Makefile.am |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index 89140db..b840f16 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -669,7 +669,6 @@ gtk_private_h_sources =             \
        gtktexttypes.h          \
        gtktextutil.h           \
        gtkthemingbackgroundprivate.h \
-       deprecated/gtkthemingengineprivate.h \
        gtktrashmonitor.h       \
        gtktogglebuttonprivate.h \
        gtktoolbarprivate.h     \