add ifdefs around the change_to_first_and_clear since that's a linux only
    
    Wed Jun 11 09:13:50 2003  George Lebl <jirka@5z.com>
    
    	* daemon/gdm.c: add ifdefs around the change_to_first_and_clear since
    	  that's a linux only function.  Fixes compilation on non-linux.