patch was slightly modified to be applied to openssh-7.2_p2
Original patch:
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/monitor.h.diff?r1=1.19&r2=1.20

===================================================================
RCS file: /cvs/src/usr.bin/ssh/monitor.h,v
retrieving revision 1.19
retrieving revision 1.20
diff -u -r1.19 -r1.20
--- a/monitor.h
+++ b/monitor.h
@@ -58,21 +58,17 @@
 	MONITOR_REQ_TERM = 50,
 };
 
-struct mm_master;
 struct monitor {
 	int			 m_recvfd;
 	int			 m_sendfd;
 	int			 m_log_recvfd;
 	int			 m_log_sendfd;
-	struct mm_master	*m_zback;
-	struct mm_master	*m_zlib;
 	struct kex		**m_pkex;
 	pid_t			 m_pid;
 };
 
 struct monitor *monitor_init(void);
 void monitor_reinit(struct monitor *);
-void monitor_sync(struct monitor *);
 
 struct Authctxt;
 void monitor_child_preauth(struct Authctxt *, struct monitor *);