Fix socket-flag/TCP_NODELAY on Mac OS X

Hi All,

OpenVPN 2.3.4 will currently throw a warning of "NOTE: setsockopt
TCP_NODELAY=1 failed (No kernel support) when attempting to use the
TCP_NODELAY socket option on Mac OS X/Darwin. Kernel support is there,
however the required header file where TCP_NODELAY is defined is not being
included. This patch simply alters syshead.h to include <netinet/tcp.h> on
Darwin platforms.

Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <A1005665-126D-45D5-A6F2-75ED0EAE30FE@sparklabs.com>
URL: http://article.gmane.org/gmane.network.openvpn.devel/8809

Signed-off-by: Gert Doering <gert@greenie.muc.de>

src/openvpn/syshead.h

@@ -349,6 +349,14 @@
 
 #endif /* TARGET_DRAGONFLY */
 
+#ifdef TARGET_DARWIN
+
+#ifdef HAVE_NETINET_TCP_H
+#include <netinet/tcp.h>
+#endif
+
+#endif /* TARGET_DARWIN */
+
 #ifdef WIN32
 #include <iphlpapi.h>
 #include <ntddndis.h>