Add missing include for getrusage(2)

Index: maa/timer.c
--- maa/timer.c.orig
+++ maa/timer.c
@@ -29,6 +29,8 @@
  *
  */
 
+#include <sys/resource.h>
+
 #include "maaP.h"
 
 static hsh_HashTable _tim_Hash;
