disable poll on aix

Changes

@@ -4,6 +4,9 @@ Revision history for libev, a high-performance and full-featured event loop.
         - remove dependency on sys/queue.h on freebsd (patch by Vanilla Hsu).
         - configure now prepends -O3, not appends it, so one can still
           override it.
+        - disable poll backend on AIX, the poll header spams the namespace
+          and it's not worth working around dead platforms (reported
+          and analyzed by Aivars Kalvans).
 
 3.9  Thu Dec 31 07:59:59 CET 2009
 	- signalfd is no longer used by default and has to be requested

ev.c

@@ -346,6 +346,12 @@ extern "C" {
 
 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
 
+#ifdef _AIX
+/* AIX has a completely broken poll.h header */
+# undef EV_USE_POLL
+# define EV_USE_POLL 0
+#endif
+
 #ifndef CLOCK_MONOTONIC
 # undef EV_USE_MONOTONIC
 # define EV_USE_MONOTONIC 0