[core] clear FDEVENT_RDHUP if no POLLRDHUP

(fix for poll() on FreeBSD 11)

src/fdevent_linux_sysepoll.c

@@ -26,6 +26,9 @@ static int fdevent_linux_sysepoll_event_set(fdevents *ev, fdnode *fdn, int event
     int op = (-1 == fdn->fde_ndx) ? EPOLL_CTL_ADD : EPOLL_CTL_MOD;
     int fd = fdn->fde_ndx = fdn->fd;
     struct epoll_event ep;
+  #ifndef EPOLLRDHUP
+    events &= ~FDEVENT_RDHUP;
+  #endif
     ep.events = events | EPOLLERR | EPOLLHUP;
     ep.data.ptr = fdn;
     return epoll_ctl(ev->epoll_fd, op, fd, &ep);

src/fdevent_poll.c

@@ -47,6 +47,10 @@ static int fdevent_poll_event_set(fdevents *ev, fdnode *fdn, int events) {
 	int fd = fdn->fd;
 	int k = fdn->fde_ndx;
 
+      #ifndef POLLRDHUP
+	events &= ~FDEVENT_RDHUP;
+      #endif
+
 	if (k >= 0) {
 		if ((size_t)k >= ev->used || ev->pollfds[k].fd != fd) return (errno = EINVAL, -1);
 		ev->pollfds[k].events = events;