Fix compilation on non-linux POSIX systems

Author: vbwagner

src/bin/pgbench/pgbench.c

@@ -105,8 +105,13 @@ static int	pthread_join(pthread_t th, void **thread_return);
 #ifdef USE_POLL
 #define SCKTWTMTHD "poll"
 #undef MAXCLIENTS
+#ifdef POLLRDHDUP
 #define POLL_EVENTS (POLLIN|POLLPRI|POLLRDHUP)
 #define POLL_FAIL (POLLERR|POLLHUP|POLLNVAL|POLLRDHUP)
+#else
+#define POLL_EVENTS (POLLIN|POLLPRI)
+#define POLL_FAIL (POLLERR|POLLHUP|POLLNVAL)
+#endif
 #define PFD_CLREV(s) { do { if ((s)->pfdp) { ((s)->pfdp)->revents = 0; } } while(0); }
 #define PFD_ZERO(s) { do { if ((s)->pfdp) { memset((s)->pfdp, 0, sizeof(struct pollfd)); } } while(0); }
 #define PFD_SETFD(s) { do { ((s)->pfdp)->fd = PQsocket((s)->con); } while(0); }