Modified UNIX simulator port so all references to native unix

stuff is in the executive source proper in the file cpu.c.  This
should help avoid conflicts between RTEMS POSIX files and UNIX files.

c/src/lib/libbsp/unix/posix/timer/timer.c

@@ -16,8 +16,8 @@
  *  $Id$
  */
 
-#include <rtems.h>
 
+#include <bsp.h>
 #include <time.h>
 #include <sys/time.h>