Add #include <sys/resource.h>

My apologies for missing these #includes, I must have confused the
dependencies with a wrong timestamp or something.

usr.bin/vmstat/vmstat.c

@@ -54,6 +54,7 @@ static const char sccsid[] = "@(#)vmstat.c	8.1 (Berkeley) 6/6/93";
 #include <sys/signal.h>
 #include <sys/fcntl.h>
 #include <sys/ioctl.h>
+#include <sys/resource.h>
 #include <sys/sysctl.h>
 #include <sys/vmmeter.h>
 

usr.sbin/iostat/iostat.c

@@ -102,6 +102,7 @@
 
 #include <sys/param.h>
 #include <sys/errno.h>
+#include <sys/resource.h>
 #include <sys/sysctl.h>
 
 #include <err.h>