Add OpenBSD to ifdef list since it has CLOCK_MONOTONIC.

Signed-off-by: Brad Smith <brad@comstyle.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

qemu-timer-common.c

@@ -50,7 +50,8 @@ static void __attribute__((constructor)) init_get_clock(void)
 {
     use_rt_clock = 0;
 #if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \
-    || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
+    || defined(__DragonFly__) || defined(__FreeBSD_kernel__) \
+    || defined(__OpenBSD__)
     {
         struct timespec ts;
         if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {