libgloss: ft32: delete unused/invalid assembly file

This is a .c file, not assembly, and it's a duplicate (same content)
as the existing sim-lseek.c.  Delete it since it's unused and doesn't
actually compile.

libgloss/ft32/sim-lseek.S

@@ -1,31 +0,0 @@
-/*
- * sim-lseek.S -- write interface for FT32 simulator
- *
- * Copyright (C) 2015 FTDI (support@ftdichip.com)
- *
- * The authors hereby grant permission to use, copy, modify, distribute,
- * and license this software and its documentation for any purpose, provided
- * that existing copyright notices are retained in all copies and that this
- * notice is included verbatim in any distributions. No written agreement,
- * license, or royalty fee is required for any of the authorized uses.
- * Modifications to this software may be copyrighted by their authors
- * and need not follow the licensing terms described here, provided that
- * the new terms are clearly indicated on the first page of each file where
- * they apply.
- */
-
-#include <sys/types.h>
-#include <errno.h>
-
-/*
- * lseek -- Since a simulated serial port is non-seekable, we return
- * an error.
- */
-off_t
-_lseek (int fd,
-       off_t offset,
-       int whence)
-{
-  errno = ESPIPE;
-  return ((off_t)-1);
-}