better includes?

libc/runevsmprint.c

@@ -11,22 +11,9 @@
  * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
  * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
  */
-/*
- * Plan 9 port version must include libc.h in order to 
- * get Plan 9 debugging malloc, which sometimes returns
- * different pointers than the standard malloc. 
- */
-#ifdef PLAN9PORT
 #include <u.h>
 #include <libc.h>
 #include "fmtdef.h"
-#else
-#include <stdlib.h>
-#include <string.h>
-#include "plan9.h"
-#include "fmt.h"
-#include "fmtdef.h"
-#endif
 
 static int
 runeFmtStrFlush(Fmt *f)