[mtools] mformat with -C option under Cygwin

[Eugene Kotlyarov]

Hi.

I've found that -C option in mformat don't work under Cygwin, I think 
there is some  incompatibilty with flock function, after locking it 
can't write to file. Here is a small patch that fixes it.

*** plain_io.c.orig     Mon Apr 19 23:54:42 2004
--- plain_io.c  Mon Apr 19 22:19:57 2004
***************
*** 644,649 ****
--- 644,650 ----
                return NULL;
        }
  #ifndef __EMX__
+ #ifndef __CYGWIN__
        /* lock the device on writes */
        if (locked && lock_dev(This->fd, mode == O_RDWR, dev)) {
                if(errmsg)
***************
*** 663,668 ****
--- 664,670 ----
                return NULL;
        }
  #endif
+ #endif
        /* set default parameters, if needed */
        if (dev){               
                if ((!IS_MFORMAT_ONLY(dev) && dev->tracks) &&