OpenBSD doesn't support timeb api

--- src/c/wrapper.h.orig	Fri Jul 31 18:19:37 2020
+++ src/c/wrapper.h	Fri Jul 31 18:21:15 2020
@@ -51,7 +51,12 @@
 #define DWORD unsigned long
 #endif
 
-#include <sys/timeb.h>
+struct timeb {
+	time_t  time;                   /* seconds since the Epoch */
+	unsigned short millitm;         /* + milliseconds since the Epoch */
+	short   timezone;               /* minutes west of UTC */
+	short   dstflag;                /* DST == non-zero */
+};
 
 #include "property.h"
 #include "wrapper_jvminfo.h"