Use <sys/ioctl.h> instead of <sys/filio.h> to get both the prototype for

ioctl(2) and the definition of FIONREAD.

git-svn-id: http://www.varnish-cache.org/svn/trunk@335 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_backend.c

@@ -36,7 +36,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <sys/select.h>
-#include <sys/filio.h>
+#include <sys/ioctl.h>
 
 #include <event.h>