writefrudata: drop unused dynamic linking header

Drop unused header: dlfcn.h

Change-Id: I1ea305913572003fabf0c2b76e75f04640bb55cb
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/writefrudata.cpp b/writefrudata.cpp
index 181fa3c..1fa363a 100644
--- a/writefrudata.cpp
+++ b/writefrudata.cpp
@@ -4,7 +4,6 @@
 #include "frup.hpp"
 #include "types.hpp"
 
-#include <dlfcn.h>
 #include <host-ipmid/ipmid-api.h>
 #include <mapper.h>
 #include <systemd/sd-bus.h>