gtkunixprint: Add support for g_autoptr()

https://bugzilla.gnome.org/show_bug.cgi?id=743640

gtk/Makefile.am

@@ -323,6 +323,7 @@ gtk_unix_print_public_h_sources = 	\
 	gtkprintunixdialog.h		\
 	gtkprinter.h			\
 	gtkprintjob.h			\
+	gtkunixprint-autocleanups.h	\
 	gtkunixprint.h
 endif
 

gtk/gtkunixprint-autocleanups.h

@@ -0,0 +1,28 @@
+/* GTK - The GIMP Toolkit
+ * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#if !defined (__GTK_UNIX_PRINT_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtkunixprint.h> can be included directly."
+#endif
+
+#ifndef __GI_SCANNER__
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GtkPrintJob, g_object_unref)
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GtkPrinter, g_object_unref)
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GtkPrintUnixDialog, g_object_unref)
+
+#endif

gtk/gtkunixprint.h

@@ -24,6 +24,8 @@
 #include <gtk/gtkprintjob.h>
 #include <gtk/gtkprintunixdialog.h>
 
+#include <gtk/gtkunixprint-autocleanups.h>
+
 #undef __GTK_UNIX_PRINT_H_INSIDE__
 
 #endif /* __GTK_UNIX_PRINT_H__ */