stream-ssl: Add support for Windows platform.

This commit creates events and through poll_fd_wait_event()
associates them with socket file descriptors to get woken up
from poll_block().

Some other changes:

* Windows does not have sys/fcntl.h but has a fcntl.h
On Linux, there is fctnl.h too.

* include <openssl/applink.c> to handle different C-Runtime linking
of OVS and openssl libraries as suggested at
https://www.openssl.org/support/faq.html#PROG2

The above include will not be needed if we compile Open vSwitch with
/MD compiler option.

* SHUT_RDWR is equivalent to SD_BOTH on Windows.

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>

lib/socket-util.h

@@ -88,4 +88,15 @@ char *ss_format_address(const struct sockaddr_storage *,
 size_t ss_length(const struct sockaddr_storage *);
 const char *sock_strerror(int error);
 
+#ifdef _WIN32
+/* Windows defines the 'optval' argument as char * instead of void *. */
+#define setsockopt(sock, level, optname, optval, optlen) \
+    rpl_setsockopt(sock, level, optname, optval, optlen)
+static inline int rpl_setsockopt(int sock, int level, int optname,
+                                 const void *optval, socklen_t optlen)
+{
+    return (setsockopt)(sock, level, optname, optval, optlen);
+}
+#endif
+
 #endif /* socket-util.h */