Fixes for OpenBSD

[Jeremy Evans <code@jeremyevans.net>]

I'm not sure if these issues are specific to OpenBSD or not, but they
are required on OpenBSD.

With these two patches, kgio-2.3.3 passes the included tests on OpenBSD
except for one failure:

1) Failure:
test_wait_writable_set(TestKgioTcpConnect) [test/test_tcp_connect.rb:69]:
<"waited"> expected but was
<nil>.

Hope this helps,
Jeremy

Fix kgio_peek by adding an empty kgio_autopush_recv
if !KGIO_NOPUSH.

--- ext/kgio/autopush.c.orig	Thu May  5 11:02:08 2011
+++ ext/kgio/autopush.c	Thu May  5 11:02:12 2011
@@ -242,6 +242,7 @@ static void push_pending_data(VALUE io)
 		rb_sys_fail("setsockopt(TCP_CORK/TCP_NOPUSH, 1)");
 }
 #else /* !KGIO_NOPUSH */
+void kgio_autopush_recv(VALUE io){}
 void init_kgio_autopush(void)
 {
 }

getaddrinfo gives an error if you use AF_UNSPEC as the ai_family,
the man page says PF_UNSPEC should be used.  And other entries
in hints need to be 0 or NULL.  

--- ext/kgio/connect.c.orig	Wed Dec 31 16:00:00 1969
+++ ext/kgio/connect.c	Thu May  5 10:47:10 2011
@@ -69,7 +69,8 @@ static VALUE tcp_connect(VALUE klass, VALUE ip, VALUE 
 	rc = snprintf(ipport, sizeof(ipport), "%u", uport);
 	if (rc >= (int)sizeof(ipport) || rc <= 0)
 		rb_raise(rb_eArgError, "invalid TCP port: %u", uport);
-	hints.ai_family = AF_UNSPEC;
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = PF_UNSPEC;
 	hints.ai_socktype = SOCK_STREAM;
 	hints.ai_protocol = IPPROTO_TCP;
 	/* disallow non-deterministic DNS lookups */