delete unused header umn.h

diff -L arch/um/include/umn.h -puN arch/um/include/umn.h~uml-delete-unused-header-umn_h /dev/null
@@ -1,27 +0,0 @@
-/* 
- * Copyright (C) 2000 Jeff Dike ([email protected])
- * Licensed under the GPL
- */
-
-#ifndef __UMN_H
-#define __UMN_H
-
-extern int open_umn_tty(int *slave_out, int *slipno_out);
-extern void close_umn_tty(int master, int slave);
-extern int umn_send_packet(int fd, void *data, int len);
-extern int set_umn_addr(int fd, char *addr, char *ptp_addr);
-extern void slip_unesc(unsigned char s);
-extern void umn_read(int fd);
-
-#endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */