Rearrange include headers (needed on some platforms).
diff --git a/Modules/nismodule.c b/Modules/nismodule.c
index 00c3561..ab5b9d0 100644
--- a/Modules/nismodule.c
+++ b/Modules/nismodule.c
@@ -14,11 +14,11 @@
 #include "modsupport.h"
 #include "ceval.h"
 
-#include <rpcsvc/ypclnt.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <rpc/rpc.h>
 #include <rpcsvc/yp_prot.h>
+#include <rpcsvc/ypclnt.h>
 
 static object *NisError;