ctrl: Attempt fix the build on FreeBSD and add include file

IPPROTO_TCP is defined in netinet/in.h. Include it and hope the
build is fixed for FreeBSD.
diff --git a/src/ctrl/control_if.c b/src/ctrl/control_if.c
index 54bca23..59cf255 100644
--- a/src/ctrl/control_if.c
+++ b/src/ctrl/control_if.c
@@ -32,6 +32,7 @@
 #include <arpa/inet.h>
 
 #include <netinet/tcp.h>
+#include <netinet/in.h>
 
 #include <sys/fcntl.h>
 #include <sys/ioctl.h>