updating bsd patch, moving it back to usr.bin

Change-Id: Ibc356c932693729ebf86cc4cc51aeca65163af9b

usr.bin/patch/backupfile.h

@@ -0,0 +1,42 @@
+/*
+ * $OpenBSD: backupfile.h,v 1.6 2003/07/28 18:35:36 otto Exp $
+ * $DragonFly: src/usr.bin/patch/backupfile.h,v 1.3 2007/09/29 23:11:10 swildner Exp $
+ * $NetBSD: backupfile.h,v 1.6 2008/09/19 18:33:34 joerg Exp $
+ */
+
+/*
+ * backupfile.h -- declarations for making Emacs style backup file names
+ * Copyright (C) 1990 Free Software Foundation, Inc.
+ * 
+ * This program is free software; you can redistribute it and/or modify it
+ * without restriction.
+ * 
+ * This program 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.
+ * 
+ */
+
+/* When to make backup files. */
+enum backup_type {
+	/* Never make backups. */
+	none,
+
+	/* Make simple backups of every file. */
+	simple,
+
+	/*
+	 * Make numbered backups of files that already have numbered backups,
+	 * and simple backups of the others.
+	 */
+	numbered_existing,
+
+	/* Make numbered backups of every file. */
+	numbered
+};
+
+extern enum backup_type backup_type;
+extern const char	*simple_backup_suffix;
+
+char		*find_backup_file_name(const char *file);
+enum backup_type get_version(const char *version);