BUILD: server: remove a build warning introduced by latest series
We get this when Lua is disabled, just a missing include.
In file included from src/queue.c:18:0:
include/proto/server.h:51:39: warning: 'struct appctx' declared inside parameter list [enabled by default]
diff --git a/include/proto/server.h b/include/proto/server.h
index d11150a..7c9574e 100644
--- a/include/proto/server.h
+++ b/include/proto/server.h
@@ -26,6 +26,7 @@
#include <common/config.h>
#include <common/time.h>
+#include <types/applet.h>
#include <types/dns.h>
#include <types/proxy.h>
#include <types/queue.h>