net-mgmt/openbmp: fix build with GCC architectures

Building with GCC requires include sys/types.h in Server/src/Logger.h.

/wrkdirs/usr/ports/net-mgmt/openbmp/work/openbmp-0.14.0/Server/src/Logger.h:99:27: error: 'u_char' has not been declared
     void setWidthFunction(u_char width);

PR:		239329
Approved by:	pizzamig (maintainer), linimon (mentor)
Differential Revision:	https://reviews.freebsd.org/D21026

net-mgmt/openbmp/files/patch-Server_src_Logger.h

@@ -0,0 +1,10 @@
+--- Server/src/Logger.h.orig	2019-07-20 08:42:40 UTC
++++ Server/src/Logger.h
+@@ -13,6 +13,7 @@
+ #include <iostream>
+ #include <cstdint>
+ 
++#include <sys/types.h>
+ 
+ /*
+  * DEBUG is a macro for DebugPrint with FILE, LINE, FUNCTION added