Don't install private headers

gdk/Makefile.am

@@ -79,7 +79,6 @@ gdk_public_h_sources =				\
 	gdkcursor.h				\
 	gdkdevice.h				\
 	gdkdevicemanager.h			\
-	gdkdeviceprivate.h			\
 	gdkdisplay.h				\
 	gdkdisplaymanager.h			\
 	gdkdnd.h				\
@@ -114,6 +113,7 @@ gdk_built_private_headers =			\
 
 gdk_private_headers =				\
 	gdkinternals.h				\
+	gdkdeviceprivate.h			\
 	gdkintl.h				\
 	gdkpoly-generic.h			\
 	gdkregion-generic.h