*: assorted warning fixes

A few warnings slipped through the cracks...

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/pimd/pim_int.c b/pimd/pim_int.c
index 2ff1a11..0bdd772 100644
--- a/pimd/pim_int.c
+++ b/pimd/pim_int.c
@@ -22,6 +22,7 @@
 
 #include <string.h>
 #include <netinet/in.h>
+#include <arpa/inet.h>
 
 #include "pim_int.h"