Move ifdef check for EPOLLRDHUP

We checked for EPOLLRDHUP before including sys/epoll.h which led to
compilation failures.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4086 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_waiter_epoll.c

@@ -37,10 +37,6 @@
 
 #if defined(HAVE_EPOLL_CTL)
 
-#ifndef EPOLLRDHUP
-#  define EPOLLRDHUP 0
-#endif
-
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
@@ -50,6 +46,10 @@
 
 #include <sys/epoll.h>
 
+#ifndef EPOLLRDHUP
+#  define EPOLLRDHUP 0
+#endif
+
 #include "shmlog.h"
 #include "cache.h"
 #include "cache_waiter.h"