zebra: Fix some warnings found during compile.

This commit fixes some warnings found in Martin's Testbed
that compiles sun solaris and freebsd images.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
diff --git a/zebra/if_ioctl.c b/zebra/if_ioctl.c
index 8df877d..99328a1 100644
--- a/zebra/if_ioctl.c
+++ b/zebra/if_ioctl.c
@@ -30,6 +30,7 @@
 #include "memory.h"
 #include "log.h"
 #include "vrf.h"
+#include "vty.h"
 
 #include "zebra/interface.h"
 #include "zebra/rib.h"